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September 26, 2016

Search: How many oxygen atoms are in 2.90g of quartz?

Number of results: 6,712

Science
Plz correct me!! A student combined water, sugar, and salt in a beaker. Which of the following statements is true? (1 point) The individual substances can be separated by physical means. The individual substances cannot be separated by physical means.* A new substance is made ...
January 28, 2016 by Vanessa

Chemistry
Consider diamond and graphite. Which of the following is true? (A) Graphite should have a higher melting point than diamond. (B) Differences in composition account for the different properties of gaphite and diamond. (C) Amorphous soilds are likely to have highe meltong points...
February 10, 2010 by Bouforyou

Chemistry
A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157 of the compound produced 0.213g CO2 and 0.0310 g H20. In another experiment, it is found that 0.103g of the compound produces 0.0230 g NH3. What is the empirical formula of the compound? this ...
April 14, 2010 by Anonymous

Science (atoms) 8th grade
Speeds up or slows down? By stirring a gas in a liquid, its solubility ____________ the dissolving process. High or low? A gas's solubility is is faster in a liqud when under __________. How do the methods of speeding the rate of solution for dissolving a solid in a liquid ...
March 10, 2009 by Twilight lover

chem
Consider the following chemical equilibrium: SO3(g) --> SO2(g) + 1/2 O2(g) and Delta H = 98.9J i. adding oxygen gas ii. compressing the system at constant temperature iii. adding argon gas iv. removing sulfur dioxide gas v. decreasing the temperature Which of the above (i-v...
March 9, 2008 by Anonymous

Chemistry
Calculate E°cell (in volts) for a fuel cell that employs the reaction between methane gas and oxygen to form carbon dioxide and water. (to 4 significant figures) ∆G⁰f for CH4 = -50.5 kJ/mol ∆G⁰f for CO2 = -394.4 kJ/mol F = 96485/mol e- I got 0.4455 V ...
April 12, 2013 by Anonymous

Chemistry
Balance the following equation for a half reaction that occurs in acidic solution. Use e– as the symbol for an electron. U^4+ --> UO2^+ There is a hint: In acidic solution, you may add H2O and H as needed to balance oxygen and hydrogen. When finished, don\'t forget to ...
April 28, 2014 by Clueless

chemistry
Mg + O2 ------> MgO if 1.00 g of magnesium is ignited in a flask containing 0.500liters of oxygen at STP, how many grams of magnesium oxide areproduced? what is the name and the amount of the reactant inexcess? My work: 1g Mg/24.3g=0.041 mol Mg; 0.5L O2/22.4L=0.022 mol O2; ...
December 30, 2014 by Lisa

physics
Which of the following summarizes Rutherford's model of the atom? Choose one answer. a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the nucleus like planets ...
May 1, 2011 by ashley --- HELP PLEASEE!!!

Chemistry
So, they give me a word equation, where I am suppose to try and create a balanced equation for it. Ammonium phosphate and barium hydroxide react to form ammonium hydroxide and barium phosphate. 2(NH4)3PO4 + 3BaOH2 → 6NH4OH + Ba3(PO4)2 [I was thinking there should be ...
February 20, 2012 by Matthew

Chemistry
Can someone check my answers for me thank you. This is my 3rd time posting this one up...maybe its just not going through bc I don't see it on the current ?s. 4NH3 + 7O2 --> 4NO2 + 6H2O 1)How many grams of oxygen are necessary to produce 4.50 moles of NO2? answer: 252 grams...
January 9, 2008 by Mike

science Help 911!!
One way the modern atomic model differs from Thompson's atomic model is that electrons are no longer scattered throughout an atoms positive matter like chocolate chips in cookie dough. Instead, each electron is outside of the nucleus occupying a specifically ? A. Atomic number...
November 14, 2014 by blue

Chemistry, Physics (Radiation Toxicology)
a) Na-22 decays in two ways. In 100 atoms of Na-22 decaying, how many would decay by positron emission and how many would decay by electron capture? Why is the yield of photon gamma (+/-) so high? b) In 100 decays of Ra-226, how many decays would result in emission of one ...
September 27, 2011 by Naresh

chemistry
Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane. 2 NH3(g) + 3 O2(g) + 2 CH4(g) 2 HCN(g) + 6 H2O(g) If 5.00 x 10^3 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield? i ...
February 1, 2009 by lyne

CHEMISTRY
Given that Mg(ClO3)2 decomposes into magnesium chloride and oxygen: A) Write a balanced equation for this reaction. I got Mg(ClO3)2 yields MgCl2 + 3 O2 Is that right? B) If 0.302 grams of O2 is lost from 1.890 grams of a mixture of Mg(ClO3)2 and an inert material, what is the ...
September 30, 2013 by Allie

CHEMISTRY
Given that Mg(ClO3)2 decomposes into magnesium chloride and oxygen: A) Write a balanced equation for this reaction. I got Mg(ClO3)2 yields MgCl2 + 3 O2 Is that right? B) If 0.302 grams of O2 is lost from 1.890 grams of a mixture of Mg(ClO3)2 and an inert material, what is the ...
September 30, 2013 by Allie

CHEM
Why is iodine a different colour in different solutions? Iodine in water is a dirty brown ikky color due to the polar water molecules' attraction for the iodine atoms since they are polar, too, due to instantaneous dipole-induced dipole attractions. In hexane, however, iodine ...
February 27, 2007 by Jon

science
what will be the law of conversion of a) 65 grams 70 grams b) magnesium + oxygen = magnesium oxide 45 grams ? grams 80 grams c) sodium hydroxide + hydrochoride acid 40 grams 36.5 grams sodium chloride + water ? grams 18 grams
August 4, 2012 by Magaly

Soil Chemistry
Gasoline producers add oxygenated chemical compounds to reduce the amount of carbon monoxide produced when the fuel is burned. Methyl t-butyl ether (MTBE) is one such oxygenate that is no longer used because of health and environmental concerns. what are the correct exponents ...
July 5, 2014 by John

Chemistry
Draw Lewis Structure for BrO3^- The textbook answer involves a central Br atom with one lone electron pair and five shared pairs (two double bonds and one single bonds). This gives Br twelve electrons rather than the typical eight. I understand that some atoms like Br have ...
August 6, 2012 by Parker

Calculate the oscillation frequency f of the H2 mo
When displaced from equilibrium by a small amount, the two hydrogen atoms in an \rm H_{2} molecule are acted on by a restoring force F_{x}=-k_1 x with k_1 = 510 N/m. Calculate the oscillation frequency f of the H2 molecule. Use m_eff = m/2 as the "effective mass" of the system...
April 15, 2010 by Tyler

physics
Thanks for the answer. I ask If one proton and one neutron are added to the nucleus of a nitrogen atom, which atom will the new nucleus look like? And you gave me the answer: The new atom would be oxygen, isotope 16. Could you please explain to me how.
March 3, 2012 by Anonymous

chem
Rank the following elements by electron affinity, from most positive to most negative EA value. Rank from most positive to most negative. To rank items as equivalent, overlap them. argon,sodium,iodine,oxygen,phosphorus
November 16, 2015 by rabia ugucu

chem
Rank the following elements by electron affinity, from most positive to most negative EA value. Rank from most positive to most negative. To rank items as equivalent, overlap them. argon,sodium,iodine,oxygen,phosphorus
November 16, 2015 by rabia

chem
balance 1-butanol + oxygen=carbon dioxide+water how many grams of carbon dioxide and water are produced when 130.6 grams of 1-butanol is completly burned?
December 1, 2009 by lynn

chemistry
Are the characteristics or properties of the elements making up a compound different from the characteristics or properties of the compound? For example, are the properties of oxygen and hydrogen different from the properties of water? Explain.
October 13, 2014 by anonymous

chemistry
which orbitals in the molecular orbital diagram contain the lone pair electrons around O? My answer: one of the lone pairs on oxygen exist in an "s" orbital. two of the lone pairs exist in "p" orbitals not involved in bonding. -is this correct.
May 28, 2008 by Andrew

chemistry
ethane,C2H6 burns in oxygen. A. what are the products of the reaction? B. write the balanced equation for the reaction. C. what mass of O2, in grams is required for complete combustion of 13.6 of ethane? D. what is the total mass of products expected from the combustion of 13....
October 7, 2013 by adriane

Fitness Topics
When you massage an exercised muscle, you help to A. increase the efficiency for the removal of wastes. B. decrease the amount of oxygen moving to the muscle. C. decrease the amount of blood moving to the muscle. D. increase its lifting capacity. im going with B
March 13, 2014 by Jose

Chem
Define isoelectronic series. Put the K+, Ca2+, Cl-, and Ar ions and atoms in order of increasing size and explain the trends. Count the number of electrons for each atom Then, explain the (column) size trend for Mg2+ versus Ca2+ ions Is the order cl k ca Ar? How would you ...
November 22, 2014 by Feather

biology
I have a question about reduced and oxidized chemicals and potenital enery. Reduced have weaker PE because they hold on to their electrons and oxidized have strong PE because they can let go electrons right? If I am right then why is that CO2 has a low PE because Oxygen is ...
October 20, 2009 by Anonymous

Marine Science
How much of the oxygen we breathe is produced by pytoplankton? 20%, 35%, 50%, 7% I think the answer is 50%. Am I correct. All of the following are adaptations some phytoplankton have for floating except? 1) Cells have large cavity in the center 2) spines 3) reducing surface ...
November 10, 2009 by Hannah

chemistry
Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ) −! NaOH(aq) + O2(g) What mass of O2 is produced when 24 g of Na2O2 react? What mass of water is needed to react completely with the Na2O2?
May 1, 2015 by Linda

chemistry
A sealed container comtains 1.50 mol of nitrogen gas, 2.00 mol of oxygen gas and 3.50 mol of argon gas. If the total pressure is 900 kPa, what is the pressure of the nitrogen gas? I dont know which formula to use
January 19, 2015 by Cutter

Science
I am doing an experiment about rust. I need a way to measure the rust that grows on various nails submerged in glasses of water (and other stuff). My plan is to use an analytical balance, measure nails with no rust and the nails after rusting and the second weight should be ...
November 25, 2006 by Jane

Physics
One gram of palladium has 5.66×10^21 atoms, and each palladium atom has 46 electrons. How many electrons are contained in 7.00g of palladium? The elemental charge is1.6×10^−19C. Answer in units of electrons. The answer is 1.82252x10^24 for Part A. i need help with part B...
February 8, 2015 by Danny

physics
One gram of palladium has 5.66×10^21 atoms, and each palladium atom has 46 electrons. How many electrons are contained in 7.00g of palladium? The elemental charge is1.6×10^−19C. Answer in units of electrons. The answer is 1.82252x10^24 for Part A. i need help with part B...
February 8, 2015 by Danny

college-- chemistry
I got stuck on this problem and I cannot figure out what to do or explain this problem. Please help me with this problem. The emission lines of one-electron atoms and ions can all be fit to the equation describing the spectrum of the hydrogen atom: E= -(2.18X10^-18J)Z^2(1/n^...
February 16, 2009 by shylo

chemistry
use a combustion reaction of liquid ethanol( C2H5OH) an air as a source of work, assuming T=25 celcius, air pressure is 1 atm, and all products are gases with partial pressure of 10 atm each. How high can one lift a 1000 kg weight by burning 100 g of ethanol. note oxygen is 21...
November 7, 2010 by Whitney

Chemistry
The sugar arabinose, C5H10O5, Molar Mass = 150.15 g/mole, was completely combusted with excess oxygen in a calorimeter. Combustion of a 0.548 g sample of arabinose caused the temperature to increase from 20.00 degrees C to 20.54 degrees C in a calorimeter with a total heat ...
November 2, 2011 by Anonymous

Pressure and Molecular Formula
2. How much potassium chlorate is needed to produce 20.0 mL of oxygen at 670 mm Hg and 20 degrees C. 3. A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100 degrees C and 760 mm Hg. If the empirical formula of this ...
December 8, 2012 by Amy

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013 by jeff

ap chemistry
Propane (C3H8) is burned in oxygen to pro- duce carbon dioxide and water. The heat of combustion of propane is -2012 kJ/mole. How much heat is given off when 3.0 mol C3H8 are reacted with 10.0 mol O2? 1. 4024 kJ 2. 2012 kJ 3. 916 kJ 4. 1555 kJ 5. 5122 kJ 6. 672 kJ 7. 6036 kJ 8...
October 31, 2012 by cheri

chemistry
If 2.33 L of propane (C3H8) at 24oC and 67.2 kPa is completely burned in excess oxygen, how many moles of carbon dioxide will be produced? a. Write a balanced equation for the reaction. b. Use stoichiometry to find the volume of carbon dioxide. c. Use the ideal gas law to ...
April 20, 2014 by Suzanne

Chemistry-atoms
A. How many protons are in one atom of fluorine - 19? B. How many neutrons are in one atom of potassium - 39? C. How many electrons are in one neutral atom of V - 51? D. What is the symbol for the element that has 78 protons? E. What is the symbol for the neutral atom that has...
April 14, 2011 by Anne

Chemistry
Consider the following equilibrium at 1000K: 2SO2 (g) + O2 (g) ˇę 2SO3 (g) A study of this system reveals that there are 3.5E-3 moles of sulfur dioxide gas, and 4.8E-3 moles of oxygen gas present in a 11.0L flask at equilibrium. The equilibrium constant for this reaction is 4....
June 3, 2012 by please help!

science
ethanol, C2H5OH, is responsible for the effts of intoxication felt after drinking alcoholic beverages. When ethanol burns in oxygen, carbon dioxide and water are produced. IF you have 256g of ethanol and 100 grams O2, calculate the amount product produced. You need to write ...
February 6, 2011 by liz

chemistry
Calculate the resulting pressure if 4.50 liters of nitrogen at 35 degrees Celsius and 790 torr and 3.7 liters of oxygen at 15 degrees Celsius and 750 torr are pumped into a 1.00 liters container at 25 degrees celsius. Assume ideal gas behavior.
March 24, 2014 by carolann

Chemistry
Calculate the number of moles of carbon atoms present in 2.2 g of ethanol (C2H6O). For this question, I would just need to find the molar mass of carbon, right? Not the molar mass of all of ethanol? So it would just be 2.2 g/ 24.02 g/mol which would equal .092. It wouldn't be ...
September 13, 2015 by Alex

Chemistry
Atom A- 6 protons, 6 electrons, 7 neutrons Atom D- 6 protons, 6 electrons, 8 neutrons Atom X- 7 protons, 7 electrons, 8 neutrons Atom Z- 8 protons, 8 electrons, 9 neutrons Which two atoms are isotopes of the same element? a. A and D b. A and Z c. X and D d. X and Z How am I ...
October 16, 2010 by timmy123

chemistry
An orgnaic compound contains C, H, No, and O. Combustion of 0.1023 g of the compound in excess oxygen yielded 0.2766 g of CO2 and 0.991g of H2O. A asample of 0.4831 g of the compound was analyzed for nitrogen by the Dumas method. At STP, 27.6 mL of dry N2was obtained. In a ...
December 9, 2007 by kaliegh

Chemistry
Hydrogen is burned in oxygen to release heat. How many grams of hydrogen gas must be burned to release enough heat to warm a 50.0 g block of iron, giving 5 mol of water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Iron has a specific heat of 0.449 J/(g·°C).
June 7, 2011 by Lance

Chemistry
If 116g of butane burns in presence of 320g of oxygen, how much carbon dioxide will be produced? What is limiting reagent? So This is how I worked it out: 116gC4H10*1/58.12(molar mass of C4H10)*8 moles CO2/2 moles C4H10*44/1(molar mass of CO2)=351.27g of CO2
March 25, 2016 by Kiana

science help pls pls
Dams are used to produce hydroelectric power. Which of these best describes the impact of a dam on the environment? It causes air pollution. It reduces the level of groundwater. It causes changes in the river ecosystem. It reduces the level of oxygen in river water. is it c ...
April 12, 2016 by Oscar

stoichiometry & partial pressure
1 mole of oxygen gas and 2 moles of ammonia are placed in a container and allowed to react at 850 C according to the equation: 4NH3 + 5O2 --> 4NO + 6H2O Q: if the total pressure in the container is 5.00 atm, what are the partial pressures for the three gases remaining? I'm ...
January 28, 2007 by dory

chemistry
when you insert a glowing wooden toothpick into a oxygen-filled pipet what would you observe? a. nothing b. the glow of the toothpick went completely out c. heard a gentle pop d. the glow of the toothpick got brighter and may have reignited. again Im checking to see if I did ...
May 10, 2010 by grace

chemistry
Carminic acid is a naturally occuring red pigment and contains only carbon, hydrogen, and oxygen. It is 53.66% C and 4.0p% H by mass. A titration required 18.02 mL of 0.0406 M NaOH to neutralize 0.3602 g of carminic acid. Assuming that there is only one acidic hydrogen per ...
October 13, 2010 by thomas richards

science need help
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
April 1, 2013 by jeff

Chemistry
I'm doing a lab in chemistry and I need help with a question, here is my data: Mass Before: 26.4 g After burned: 26.25 g Total Mass burned: .15 g 1. Calculate the mass of oxygen that was consumed while the candle burned. I think I need to use mole equations and that kind of ...
December 14, 2015 by Patti

Biology
Stroke volume is the blood pumped by the left ventricle each time it contracts. During a training run the stroke volume of a person is 0.1 dm^3 (100 cm^3). Calculate the pulse rate at an oxygen uptake of 2 dm^3/min. Is there enough information (there is a graph that comes with...
December 21, 2009 by Stuck

combustion
A glass melting furnace is burning ethane (C2H4) in pure oxygen (not air). The furnace operates at an equivalence ratio of 0.9 and consumes 30 kmol/hr of ethane. (A) Determine the energy input rate based on the LHV of the fuel. Express your result in both kW and Btu/hr. (B) ...
October 4, 2012 by paul

Chemistry Dr. Bob
Balanced Equation: 2PbS+ O2 --> 2PbO +2SO2 How many grams of oxygen are required to react with 0.124mole lead(II) sulfide? Ummmm.. I tried to convert it to grams? 0.124 mol * molar mass of PbS (239.3) = 29.67 g of PbS then tried to plug it into the equation.. 1/2 * 29.67/...
March 3, 2015 by Jennie

chemistry
Can someone tell me what steps i need to take? So confused on how to solve this An average human adult takes about 15breaths per min and exhales 23ml of co2 with each breath. If your trapped in a cave with pressure .963atm and 11C and your only source of oxygen is a breathing ...
September 23, 2014 by ailee

CHEM..
What is the major advantage of the stock system over the old naming system? The stock system is well understood world wide. And, it allows for multivalent atoms. One advantage is that some elements have more than two common valences; therefore, the "ous" and "ic" are not ...
January 4, 2007 by Bryan

chemistry
In the compound tocainide I need to identify the two groups of atoms/groups that are linked with its binding to receptor cells in the human body by hydrogen bonding. I have understood the two groups to be alcohol and acid but am stuck on the next part. Hmmm. What alcohol. I ...
February 15, 2007 by ruby

Science (Chemistry)
Can someone explain why the ratio of magnesium ions to chloride ions in MgCl2 is 1 :2 Mg is in group IIA and has two electrons in its outside shell. Cl is in group VIIA and has seven electrons in its outside shell. Mg wants to lose two electrons; Cl wants to gain one electron...
November 15, 2006 by Brian

science need help
2 H2 + O2 = 2H2O 2 grams + 32 grams=_ _ _ _ _grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts. in your response be sure to: include they type of change illustrated in the balanced eqaution explain the conservation ...
April 1, 2013 by jeff

Chemistry
A)What mass of carbon dioxide is produced from the complete combustion of 7.00×10−3 g of methane? B)What mass of oxygen is needed for the complete combustion of 7.00×10−3 g of methane?
October 3, 2011 by Hannah

chemistry
given the following data at a certain temperature, calculate K for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give dinitrogen tetraoxide 2N2 + O2 TO GIVE 2N2 K=1.2X10-35 N2O4 TO GIVE 2NO2 K=4.6X10-3 1/2N2 + O2 TO GIVE NO2 K=4.1X10-9
March 7, 2011 by karim

science
a mixture of gases contains 64g of methane, 64g of oxygen and 64g of sulphur dioxide. The pressure of the mixture is 210 kpa. what is the partial pressure (in kpa) of the methane expected to be?
July 31, 2014 by olaitan daviesstunt

Science
What did Antoine Lavoisier’s experiments demonstrate? a- Atoms always split into pairs during a chemical change. b- Mass is neither lost nor gained during a chemical change. c- Matter can be created during a chemical change. d- Energy is neither lost nor gained during a ...
February 9, 2014 by Steve

Science/Chemistry
Is this true Dispersion forces generally increase in strength as the number of electrons in a molecule increases. The number of electrons can only increase if more atoms are added to the molecule. The molecule has to stay electrically neutral. Dispersion forces are of greater ...
January 9, 2007 by Jeff

physio
Which one(s) of the essential chemical elements (H, C, O, N) does blood contain? All of them not just one of them. All amino acids contain carbon, hydrogen, oxygen and nitrogen. Blood contains several dozen proteins alone http://www.agctr.lsu.edu/Subjects/eatsmart/protein2.htm...
June 20, 2005 by Jawad

Probability
Consider a system of three molecules A, B, and C. Suppose that three units of energy can be distributed over the three atoms. Each atom can have no energy, one unit of energy, two units of energy, or all three units of energy. Assume that each of the ten possible arrangements ...
October 22, 2007 by Richard

Chemistry
Maleic acid is an organic compound composed of 41.39% C, 3.47% H, and the rest oxygen. If 0.271 mol of maleic acid has a mass of 31.4 g, what are the empirical and molecular formulas of maleic acid? So I checked the problem again, and yes this is the whole problem. I even ...
April 16, 2010 by Anonymous

Chemistry
Air entering the lungs ends up in tiny sacs called alveoli. It is from the alveoli that oxygen diffuses into the blood. The average voume of the alveoli is .00000000078 L. Assuming that the pressure in the alveoli is 1.0 atm and the temperature is 37 degrees celsius, calculate...
June 19, 2010 by Anonymous

physics
A container holds 1.1 g of oxygen at a pressure of 7.40 atm . How much heat is required to increase the temperature by 110 degree C at constant pressure? How much will the temperature increase if this amount of heat energy is transferred to the gas at constant volume?
April 6, 2010 by Kidda

chemistry
If boron hydride, B4H10, is treated with pure oxygen, it burns to give B2O3 and H2O. 2 B4H10(s) + 11 O2(g)  4 B2O3(s) + 10 H2O(g) If a 0.050-g sample of the boron hydride burns completely in O2, what will be the pressure of the gaseous water in a 4.25-L flask at 30. °C?
February 3, 2011 by Jazmin

Chemistry
Please help, I am having trouble solving these problems at nonstandard temperatures. Methanol burns in oxygen to form carbon dioxide and water. Using the balanced reaction, 2CH3OH(l) + 3OH2(g) --> 2CO2(g) + 4H2O(g) 1) Calculate delta H(rxn) in kJ at 24 degrees Celsius 2) ...
July 18, 2010 by Miguel

ap chem
Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen and methane: 2NH3(g) + 3O2(g) + 2CH4 -->2HCN + 6H2O(g) a)If 5.00 x 10^3 kg each of NH3 , O2, and CH4 are reacted what mass of HCN will be produced, assuming 100% yield? b)At the end of ...
October 11, 2010 by Emma

Physical Science
A transparent object made of glass without any color (A) absorbs all frequencies of visible light and re-emits them from atom to atom through the object. (B) absorbs all frequencies of visible light and transforms the energy into thermal energy (C) has atoms or molecules whose...
August 25, 2015 by Loren

ap chemistry
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO + O2 yields 2CO2 Delta H for this reaction is -135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 1). 270.5 mol 2). 40.5 mol 3). 12.0 mol 4). 5.41 mol 5). 16.3...
October 18, 2012 by bob

AP Chemistry
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO(g) + O2(g) --> 2CO2(g) change in H for this reaction is −135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 1. 16.3 mol 2. 40.5 mol 3. 12.0 mol 4. 5....
September 29, 2013 by Anonymous

Biology - oxidative phosphorylation
Some things I don't understand: If oxygen accepts electrons from the electron transport chain, how does it become a molecule of water? ie where does the hydrogen come from? In chemiosmosis, protons are pumped against their concentration gradient across the inner mitochondrial ...
April 23, 2008 by JJ

chemistry
Which would produce greater number of moles of product: a certain amount of hydrogen gas reacting with oxygen gas to make water, or the same amount of hydrogen gas reacting with nitrogen gas to make ammonia? Why?
April 11, 2010 by tay

Biology
1. Plant seed coats, mycorrhizae, and cuticles are examples of a. ways plants have adapted to life on land b. evolutionary adaptations to limit water absorption c. mechanisms to enhance carbon dioxide release d. both B and C D? 2. Stomata help plants a. survive on land b. ...
February 26, 2010 by mysterychicken

Chemistry
.Question part Points Submissions 1 0/0.5 2/3 Total 0/0.5 ...In the explosion of a hydrogen-filled balloon, 0.75 g of hydrogen reacted with 6.9 g of oxygen to form how many grams of water vapor? (Water vapor is the only product.) i already posted this but i dont think people ...
September 11, 2010 by Rebekah

earth science
What are the names and symbols of the two elements found in all silicate minerals? http://en.wikipedia.org/wiki/Silicate After reading see if you think Oxygen and Silicon might be the answers
November 14, 2006 by mjklolk

phy
An emphysema patient is breathing pure O2 through a face mask. The cylinder of O2 contains 0.20 ft3 of O2 gas at a pressure of 2200 lb/in2. (a) What volume would the oxygen occupy at atmospheric pressure (and the same temperature)? ft3 (b) If the patient takes in 8.0 L/min of ...
April 13, 2013 by kira

phy
An emphysema patient is breathing pure O2 through a face mask. The cylinder of O2 contains 0.20 ft3 of O2 gas at a pressure of 2200 lb/in2. (a) What volume would the oxygen occupy at atmospheric pressure (and the same temperature)? ft3 (b) If the patient takes in 8.0 L/min of ...
April 13, 2013 by kira

Are my answers correct? Chem
I really need help with balancing these equations: Can you check if my answer are correct? Please 1. Sodium Hydrogen Sulfite reacts with hydrochloric acid to produce sulfur dioxide gas, water and sodium chloride NaHSO3 + HCl = SO2 + H2O + NaCl 2. Sodium nitrate reacts with ...
March 14, 2011 by Anonymous

biology
Cellular Respiration and Photosynthesis co-exist as paired metabolic processes. Photosynthesis uses light energy to convert carbon dioxide into glucose, a simple sugar, in two steps, the light dependent and light independent reactions. Oxygen is produced as a by product ...
November 21, 2008 by Anonymous

CHEM
Hydrogen peroxide (H2O2) is decomposed according to the following reaction: 2H2O2 (l) ˇ÷ 2H2O (l) + O2 (g) If 6.00 g of aquesous solution containing hydrogen peroxide was decomposed after heating, the mass of oxygen gas collected is 2.40 g, what is the mass percentage of H2O2 ...
December 30, 2014 by CHAN

Chemical Bonding
Predict the type of bond present between carbon and suffer in vulcanized runbber? Is that ionic. Please tell me how I can figure out what bonds are present in different chemical reactions. Like phospherous nad oxygen in a DNA molecule. CS bond is covalent. Look at the ...
January 14, 2007 by Karen

chemistry
In the reaction O2+2NO->2NO2 what is the ratio of oxygen reacted to nitrogen dioxide produced? Nitrogen monoxide to nitrogen dioxide? We had to calculate the concentration of each, for which I have O2=-1.01x10^-5, NO=-2.03x10^-5 and NO2=2.04x10^-5. I'm not sure how to do it...
March 12, 2015 by alyssa

earth science
what class of minerals contains the element oxygen bonded to a metallic element http://en.wikipedia.org/wiki/Iron_oxide
April 4, 2007 by tiff

Science (please check Ms. Sue)
Please check this. Thanks! 1. Which of the following shows fossils as evidence of continental drift? a. Limestone layers in the Appalachian Mountains of North America were exactly the same as the limestone in Scotland’s highlands. b. Mesosaursus, an ancient reptile, had been ...
April 27, 2016 by SpitFireRedHead

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