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September 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
Hydrogen, H2(g), is below silver metal in the activity series of the metals. Will the following reaction occur or not occur: Ag(s) + H+(aq)  ??? Explain why or why not.
Wednesday, October 30, 2013 at 1:35pm

Chemistry
For the equation give the formula equation, ionic equation, and the net ionic equation after predicting the products and balancing. Using the solubility rules to indicate solid or aqueous each formula. AgNO3 + NaCl
Wednesday, October 30, 2013 at 12:50pm

Chemistry
For the following reaction, identify the substance oxidized, reduced and the oxidizing and reducing agents. 2SO2 + O2 ----> 2SO3
Wednesday, October 30, 2013 at 12:48pm

chemistry
N2 + 2 O2 ---> 2 NO2. Suppose 31.25 g of N and 44.0 g of oxygen react. A. Calculate the mass of Nitrogen dioxide formed. B. Which reactant is the limiting reactant? C. Calculate the mass of the excess reactant left after the reaction. D. Find the % yield if 52.3 g of NO2 is...
Wednesday, October 30, 2013 at 12:43pm

Chemistry
1- Which of these processes will lower the glass transition temperature of a glass? Increase the cooling rate Decrease the cooling rate Increase amount of network modifier Decrease amount of network modifier Quench the glass to cool the surfaces quickly Decrease the number of ...
Wednesday, October 30, 2013 at 9:07am

chemistry
calculate the molar mass of a liquid if .955grams of its vapors occupy 2.50Liters at 200 Celsius and 45 torr
Wednesday, October 30, 2013 at 6:40am

chemistry
Your x-ray lab has a monochromator consisting of a single crystal of nickel cut so that the plane lies in the cube face. At what angle (in degrees) should the cube face be tilted with respect to the incident beam in order to select radiation with a wavelength ? The lattice ...
Wednesday, October 30, 2013 at 2:23am

medical billing/codeing
the body's ongoing process of regulating its internal environment-electrolyte balance, blood chemistry, temperature, and so on-is called a. excretion b. metabolism c. homeostasis d. peristalsis
Tuesday, October 29, 2013 at 10:18pm

Chemistry
If the heat of combustion for a specific compound is -1080.0 kJ/mol and its molar mass is 58.29 g/mol, how many grams of this compound must you burn to release 300.60kJ of heat?
Tuesday, October 29, 2013 at 9:09pm

Chemistry
Why does shielding in organic molecules cause lower solubility in water?
Tuesday, October 29, 2013 at 8:19pm

AP Chemistry
Calculate the standard entropy change for the dimerization of NO2: 2NO2(g)→N2O4(g)at 298 K, if S◦ ∆H◦f J/K·mol NO2(g) 240.06 33.18 N2O4(g) 304.29 9.16 Answer in units of J/K·mol
Tuesday, October 29, 2013 at 6:45pm

AP Chemistry
This temperature represents the freezing point of ethanol. (Which means delta G = 0) What is the entropy change for the vaporization of 3.3 mol H2O(ℓ) at 100◦C and 1 atm? ∆H= 40700 J/mol. Answer in units of J/K
Tuesday, October 29, 2013 at 6:41pm

AP Chemistry
Calculate the entropy change when 4.44g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g)→2H2O(ℓ) at 298 K and 1 atm pressure. The stan- dard molar enthalpy of formation of H 2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free energy of ...
Tuesday, October 29, 2013 at 6:40pm

AP Chemistry
Calculate ∆G0 for the following reaction. 4XY + 3Z2−→2Z3X2+ 2Y2 Substance ∆H0f S0kJ/mol J/mol·K XY 205.0 75.0 Y2 −82.0 37.0 Z2 −25.0 78.0 Z3X2 −245.0 137.0 Answer in units of kJ/mol
Tuesday, October 29, 2013 at 6:38pm

Chemistry
1- Which of these processes will lower the glass transition temperature of a glass? Increase the cooling rate Decrease the cooling rate Increase amount of network modifier Decrease amount of network modifier Quench the glass to cool the surfaces quickly Decrease the number of ...
Tuesday, October 29, 2013 at 5:42pm

Chemistry
what is important about oxygen being formed during a titration?? (formed in container after it has been titrated not in the burette)
Tuesday, October 29, 2013 at 5:06pm

Chemistry
name some advantages of using acetaminophen instead of aspirin as an analgesic
Tuesday, October 29, 2013 at 4:47pm

Organic Chemistry
I want to confirm some things on solubility and boiling points(they might be right or wrong): - If a substance is soluble in water then it also has a high boiling point - If a substance has a high intermolecular force then it also has a high boiling point - Shorter ...
Tuesday, October 29, 2013 at 4:27pm

chemistry
A sample of gas in a balloon has an initial temperature of 25\({\rm \, ^{\circ}C}\) and a volume of 1670\({\rm L}\) . If the temperature changes to 82\({\rm \, ^{\circ}C}\) , and there is no change of pressure or amount of gas, what is the new volume, \(\texttip{V_{\rm 2}}{V_2...
Tuesday, October 29, 2013 at 2:05pm

chemistry
Phosphorus (p4) burns in the air to give diphophorus pentoxide. what is the blance chemical equation for the reaction
Tuesday, October 29, 2013 at 11:29am

Ap chemistry
The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 6.4 grams of man- ganese are oxidized by oxygen gas to Mn2O3 at standard state conditions? Answer in units of kJ
Tuesday, October 29, 2013 at 11:20am

Chemistry #17
When a 5.00g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 3.982 kJ-K, the temperature decreases by .210 K. Calculate the molar heat of solution of KBr. =____kJ/mol
Monday, October 28, 2013 at 11:59pm

Chemistry
Having some difficulty with this question. Can anyone help me please? Thank you in advance for your time. 85 microliters of acetophenone (120.15 g/mol, 1.03 g/ml) was reacted with 3.0mL of aq NaOCl (5% available chlorine) to give 72mg of benzoic acid (122.12 g/mol) as a white ...
Monday, October 28, 2013 at 11:07pm

Chemistry,Math
Thank you tutors!!
Monday, October 28, 2013 at 10:09pm

Chemistry - is this correct?
Write the electronic configuration for nickel(#28). I know it is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8 (b) How many electrons are there of highest energy in nickel? Is it 8? (c) how many electrons are there in the outermost energy level(orbit) of nickel? Is this 8 also?
Monday, October 28, 2013 at 9:43pm

Chemistry
How do I determine which atom in a molecule would be the strongest base? Thanks
Monday, October 28, 2013 at 9:28pm

Chemistry
Which starting material used in the air bag inflator is least important for the proper inflation of the air bag? Would it be necessary to have it present in a precise stoichiometric ratio? Why or why not? 2. What is the correct stoichiometric ratio between NaN3 and KNO3 to ...
Monday, October 28, 2013 at 9:22pm

Chemistry
Which starting material used in the air bag inflator is least important for the proper inflation of the air bag? Would it be necessary to have it present in a precise stoichiometric ratio? Why or why not? 2. What is the correct stoichiometric ratio between NaN3 and KNO3 to ...
Monday, October 28, 2013 at 9:21pm

Chemistry #25
Use enthalpy of formation data to calculate the number of moles of CO2(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1atm and 25 degrees C) a. coal C(s, graphite) = _____mole-MJ b. natural gas, CH4(g)= c. propane, C3H8(g...
Monday, October 28, 2013 at 8:54pm

Chemistry #27
Given that: H2 (g) + F2 (g) ---> 2HF (g) H(rxn)= -546.6 kJ 2H2 (g) + O2 (g) ---> 2H2O (l) H (rxn)= -571.6 kJ calculate the value for H(run) for... 2F2(g) + 2H2O (l) ---> 4HF (g) + O2 (g) _____kJ?
Monday, October 28, 2013 at 8:51pm

Chemistry
What is the electro-negativity of NO ? (Nitric oxide)
Monday, October 28, 2013 at 8:37pm

chemistry
titration question: How many moles of HCl must have been present in the 25mL of HCl solution in the 2 trials? Given: Trial 1: V of HCl= 25.00mL, V of NaOH used=29.50mL and M of NaOH=0.18M Trial 2: V of HCl=25.00mL, V of NaOH used=28.50mL and M of NaOH=0.18M
Monday, October 28, 2013 at 8:14pm

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
Monday, October 28, 2013 at 8:00pm

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
Monday, October 28, 2013 at 8:00pm

chemistry
What volume of 0.714 M K3PO4 is required to react with 27 mL of 0.97 M MgCl2 according to the equation 2 K3PO4 + 3 MgCl2 → Mg3(PO4)2 + 6 KCl Answer in units of mL
Monday, October 28, 2013 at 7:59pm

AP Chemistry
in a coffee-cup calorimeter, 50.0 mL of 0.100 M AgNO3 and 50.0 mL of 0.100 M of HCl are mixed to yield the following reaction: Ag+ (aq) + Cl- (aq) >> AgCl (s) the two solutions were initially at 22.60 degree celsius, and the final temperature is 23.40 degree celsius. ...
Monday, October 28, 2013 at 6:12pm

chemistry
what is the chemical reaction of camphor and coca cola drink
Monday, October 28, 2013 at 5:55pm

AP Chemistry
in a coffee-cup calorimeter, 50.0 mL of 0.100 M AgNO3 and 50.0 mL of 0.100 M of HCl are mixed to yield the following reaction: Ag+ (aq) + Cl- (aq) >> AgCl (s) the two solutions were initially at 22.60 degree celsius, and the final temperature is 23.40 degree celsius. ...
Monday, October 28, 2013 at 5:05pm

chemistry
calculate the lowest values of the energies of an electron, a neutron and a photon which allows diffraction from the (1,0,1) planes of silicon, using Bragg diffraction. lattice parameter 0.542nm
Monday, October 28, 2013 at 2:09pm

AP Chemistry
write an oxidation- reduction reaction for the reactants OCl- and S2O3-2
Monday, October 28, 2013 at 1:12am

Chemistry
If P4 (white phosphorous) forms different compounds with chlorine (Cl3) depending on the amount of chlorine present (limited chlorine forms PCl3 and chlorine in excess forms PCl5) design an experiment that could be performed to verify each synthesis reaction. Include a ...
Sunday, October 27, 2013 at 11:02pm

chemistry
Suppose a student diluted and titrated a bleach unknown. A single titration was performed which required 14.42 mL of 0.100 M Na2S2O3. The density of the original, undiluted bleach unknown was 1.042 g/mL. calculate the number of moles of ClO- in the sample titrated.
Sunday, October 27, 2013 at 9:38pm

chemistry
How would I find amount of P in a 100 liter solution. The liter of solution contains nitric and sulfurous acid and possibly a dissolved body... the body weighs 70 kg and there are 6.3 ppt of phosphorous in a human body.
Sunday, October 27, 2013 at 9:38pm

Chemistry - Please Help!
XeO3 + I- ----> Xe + I2 (acidic solution) CN)2 -----> CN- + OCN- (basic solution) MnO2 + SO32- ---> Mn2+ + S2O62- (acidic solution) H2SeO3 + H2S -----> S + Se (acidic solution) Cl2 ---> Cl- + ClO3- (basic solution) ClNO2 -----> NO3- + Cl- (acidic solution)
Sunday, October 27, 2013 at 8:31pm

Chemistry
When the stopper of the Erlenmeyer flask is loosened before weighing, why doesn't the carbon dioxide escape? Why isn't the mass of air displaced by the water taken into account when the the mass of water is determined?
Sunday, October 27, 2013 at 8:29pm

Chemistry
Balance the following equation for a basic solution. MnO4-+C2O4-2= Mno2 + CO3-2
Sunday, October 27, 2013 at 8:10pm

chemistry
At constant volume, the heat of combustion of a particular compound is –3599.0 kJ/mol. When 1.365 g of this compound (molar mass = 102.90 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 7.819 °C. What is the...
Sunday, October 27, 2013 at 7:53pm

chemistry
A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/°C. The observed increase in temperature is 21.1 °C at a constant pressure of one ...
Sunday, October 27, 2013 at 7:52pm

Chemistry
A student began adding titrant to the acid solution, but stopped when she suddenly realized that she forgot to add the 3 drops of phenolphthalein. When she did, the solution immediately turned dark red! What can the student do to correct this error and salvage this trial, so ...
Sunday, October 27, 2013 at 7:45pm

Chemistry
Which reaction below will occur when Cd (s) and Zn (s) are added to a solution that contains both Cd2+ and Zn2+ ions? Cd (s) + Zn2+ (aq) → Cd2+ (aq) + Zn (s) Zn (s) + Cd2+ (aq) → Zn2+ (aq) + Cd (s) Both of the above reactions occur. Neither of the above reactions ...
Sunday, October 27, 2013 at 6:41pm

chemistry
Which one of the following is not a redox reaction? PbO2(s) + Pb(s) + 2H2SO4(aq) 2PbSO4(s) + 2H2O(l) Ba(NO3)2(aq) + Na2CrO4(aq) BaCrO4(s) + 2NaNO3(aq) Zn(s) + 2MnO2(s) ZnO(s) + Mn2O3(s) 2H2O(g) 2H2(g) + O2(g)
Sunday, October 27, 2013 at 5:14pm

Chemistry
Oxygen gas can be generated by heating KClO3 in the presence of some MnO2. 2KClO3 → 2KCl + 3O2 If all the KClO3 in a mixture containing 1.58 g KClO3 and 0.30 g MnO2 is decomposed, how many liters of O2 gas will be generated at T = 25.0°C and P = 760.6 torr?
Sunday, October 27, 2013 at 4:34pm

Chemistry grd 12
for the below questions the food samples were onion juice, cornflakes, egg, milk, salad dressing and instant oatmeal. 1) Why are you required to wear safety eye wear and protective clothing while conducting an investigation of testing food samples for proteins,starch,sugar and...
Sunday, October 27, 2013 at 4:05pm

AP chemistry
001 (part 1 of 2) 10.0 points A 1.37-gram sample of compound X (of MW 88.0 g/mol) was burned in a bomb calorime- ter containing 1700 g of water. A temperature rise of 0.95◦C was observed. ∆Erxn for this re- action is −475 kJ/mol of X. What is the heat ...
Sunday, October 27, 2013 at 2:48pm

CHEMISTRY
do the positive ions or the negative ions cause the change in flame color?
Sunday, October 27, 2013 at 1:41pm

Chemistry
Two quantities A and B are directly proportional to each other. The value of A becomes 1/3 as much. What will happen to the value of B
Sunday, October 27, 2013 at 1:11pm

chemistry
Determine whether a solid forms when solutions containing the following salts are mixed. If so, write the ionic equation and the net ionic equation. KCl and Na2S
Sunday, October 27, 2013 at 12:34pm

chemistry
For magnesium, is possible to have a relative atomic mass less than 24 or more than 26? (Yes/No) Explain. I don't think it is but I can't explain it. Thank you
Sunday, October 27, 2013 at 9:12am

chemistry
A solid sample is 81.0 g sodium per 1,000,000. g substance, and contains 1.92 × 10 ^21 sodium atoms, calculate the mass (g) of the sample.
Sunday, October 27, 2013 at 2:57am

chemistry
Based on the calculations above, which of the following equations is the one represented by this experiment? Justify your answer by comparing the moles of iron consumed and the moles of copper produced to the coefficients in the equation of your choice. (16 points) Fe + CuCl2...
Saturday, October 26, 2013 at 11:45pm

Chemistry
Given the reaction 2 Na2 02 (s) + 2 H2o(i) —- 4 NaOH(s) + 02(g) triangle H= -109 KJ determine the following reactions. 16 Na2o2(s)+ 16 H2o(i)———- 32 NaOH(s) + 8 O2(g) 2 NaOH(s)—-+ 1/2 o2(g)——-Nao2(s)+ H2o(I)
Saturday, October 26, 2013 at 11:04pm

Chemistry
What is the change in internal energy of a system that does 7.02 kj of work and absorbs 888 j of heat?
Saturday, October 26, 2013 at 11:04pm

chemistry
An aqueous solution of copper (II) sulfate is a thermodynamic system under study. What typer of system is this if the solution is contained in a beaker on a laboratory table?
Saturday, October 26, 2013 at 11:04pm

Chemistry
What volume of nitrogen gas can be produced from he decomposition of 37.6 L of ammonia with both gases measured at 725 degree celsius and 5.05 pressure? In the reaction in 71 what total volume of gas at 667 celsius and 11.3 atm can be produced by the decomposition at 1.19 X 10...
Saturday, October 26, 2013 at 11:02pm

general
What are some great sites to help you with chemistry problems?
Saturday, October 26, 2013 at 10:42pm

Chemistry
How many liters of Co2(g) can be produced in the reaction of 5.24 L and 2.65 L O2 (g) if all these gases are measure at the temperature and pressure?
Saturday, October 26, 2013 at 10:36pm

Chemistry
How many liters of o2(g) measured at 22 degree and 763 Torr are consumed in the complete combustion of 2.55 L of dimethyl ether measured at 25 degree celsius and 748 Torr.
Saturday, October 26, 2013 at 10:35pm

chemistry
In the formation of smog, nitrogen and oxygen gas react to form nitrogen dioxide: N2(g)+2O2(g)→2NO2(g)How many grams of NO2 will be produced when 2.1L of nitrogen at 840mmHg and 28∘C are completely reacted? I know that you use the equation n=PV/RT to get the number...
Saturday, October 26, 2013 at 9:38pm

chemistry
A typical bathtub can hold 106 gallons of water. Calculate the mass of natural gas that would need to be burned to heat the water for a tub of this size from 56 ◦F to 87 ◦F. Assume that the natural gas is pure methane (CH4) and that the products of combustion are ...
Saturday, October 26, 2013 at 7:41pm

CHEMISTRY
Round this to three sig figs. 0.03335 Is it 0.0334? Is the rule: odd number goes up and even number stays the same? 3 is odd and is next to five...
Saturday, October 26, 2013 at 1:45pm

chemistry
Why do acids and bases conduct electricity?
Saturday, October 26, 2013 at 1:21pm

CHEMISTRY
In my lab report, I am asked to "Find the solubility of Ca(OH)2 in H2O as the temperature increases. Explain (in terms of energy) the reasons for this trend." From what I have found, Ca(OH)2's solubility goes down, but I have no idea why! It isn't a gas... it...
Saturday, October 26, 2013 at 12:20pm

chemistry
4.86 mole Mg:0.112 mole O: smaller value
Saturday, October 26, 2013 at 10:54am

Chemistry....
Wouldn't it be 3*0.234 instead of 2* 0.234? since....2Al3+ +3SO4 2- ----> Al2(SO4)3 4.) A solution is prepared by dissolving 25.0 g of aluminum sulfate in enough water to make 125.0 mL of stock solution. A 10.0 mL aliquot (portion) of this stock solution is then ...
Friday, October 25, 2013 at 10:18pm

chemistry
a 100 W electric heater operates for 10 minutes to hear the gas in a cylinder. At the same time, the gas expands from 1 L to 14 L against a constant atmospheric pressure of 4.246 atm. What is the change in internal energy in Joules of the gas?
Friday, October 25, 2013 at 9:13pm

Chemistry (reposts#6)
!A 100.0 mL aliquot of 0.200 M aqueous calcium hydroxide is mixed with ! 100.0 mL of 0.200 M aqueous aluminum nitrate. a.)! Write a complete molecular equation for this reaction, including phases b.)! Write a net ionic equation for this reaction, including phases. c.) !For ...
Friday, October 25, 2013 at 8:27pm

Chemistry (reposts#2)
A solution is prepared by dissolving 5.00 g of ferric chloride in enough water to make 500.0 mL of stock solution. A 50.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the concentrations of all ions in the final solution.
Friday, October 25, 2013 at 8:22pm

Chemistry(reposts #1)
A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the concentrations of all ions in the final solution.
Friday, October 25, 2013 at 8:18pm

Chemistry (URGENT)
Hello! Does anyone know where to find the solubility of Ca(OH)2 in water as temperature changes? I need this information to answer the discussion in a lab report.
Friday, October 25, 2013 at 8:04pm

CHEMISTRY
Ion Concentrations 1.) A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the concentrations of all ions ...
Friday, October 25, 2013 at 8:02pm

CHEMISTRY
This is regarding to the super long post. Dr.Bob, did you actually check all of my answers? Do you want me to make several small posts now? By the way I don't understand how #1 is wrong!!!!!
Friday, October 25, 2013 at 7:55pm

CHEMISTRY
******* Please check. Also check sig figs. Ion Concentrations 1.) A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water...
Friday, October 25, 2013 at 5:48pm

chemistry
Balance the following oxidation-reduction reactions, which occur in acidic solution, using the half-reaction method. (Use the lowest possible coefficients. (a) H2O2(l) + Pb(s) → H2O(l) + Pb2+(aq) (b) O2(g) + Mn(s) → H2O(l) + Mn2+(aq)
Friday, October 25, 2013 at 5:02pm

chemistry 1
How do you write balanced equations A. Neutron emission by 88Br B. Electron absorption by 116Sb C. Positron emission by 184Hg D. Alpha emission by 229Th E. Neutron capture by 200Hg
Friday, October 25, 2013 at 10:56am

chemistry
Balance these nuclear equations. Can some please help I dont understand these at all 1. 35/17 Cl + 1n -> 35/16S + _____ 2. 229/90 Th -> 4/2 He + ______ 3. 20/8 O -> 20/9F + ________ 4. 54/26Fe + 1n -> 1H + _______ 5. 104/47Ag -> 0/-1e + ______ 6. ________ + 0/-...
Friday, October 25, 2013 at 10:52am

chemistry
Consider the HF solution with the concentration of 5% (w/v). Calculate its concentration in the molarity. Use four significant figures in your answer
Friday, October 25, 2013 at 4:44am

Chemistry
Okay, I have some confusion on a lab question for chemistry. The question was if you were preforming a microscale extraction of a 0.2 g of benzoic acid/fluorenone mixture (About 6 mL of dichloromethane and 2 mL of NaOH were added through out this experiment up until the final ...
Friday, October 25, 2013 at 4:09am

CHEMISTRY URGENT
Does anyone have a "Chemistry in Context 6th edition" by mcgraw and hill book? I don't have one and my homework is in there. Page 30, questions 5,6 & 7. If you could, type out the questions for me that would be a HUGE help.
Friday, October 25, 2013 at 1:44am

Chemistry
Calculate the mass of AgCl that will dissolve in 100ml of 2 M NH3 ksp AgCl = 1.7x10^-10 and Kf of Ag(NH3)2 = 1.6x10^7
Friday, October 25, 2013 at 12:15am

Chemistry
what's the density of a cube of an unknown substance if mass is 45.2g and the side of a cube is 3.2cm?
Thursday, October 24, 2013 at 10:16pm

Chemistry
Using molar volume (STP) or the ideal gas law equation, determine the molar mass, g/mole, of each of the following:1.)11.1g of a gas that has a volume of 1.50L at STP. 2.) 0.742g of a gas that has a volume 860mL at 1.28atm and 18∘C. 3.) 2.42g of a gas that has a volume 1...
Thursday, October 24, 2013 at 9:35pm

chemistry
A 0.286g sample of carbon dioxide, CO2, has a volume of 585mL and a pressure of 495mmHg . What is the temperature, in kelvins and degrees Celsius, of the gas?
Thursday, October 24, 2013 at 8:38pm

chemistry
Assign oxidation states to all atoms in compound. C2H2O4 i already know the other 2 but how do i find C C - ? H - +1 O - -2
Thursday, October 24, 2013 at 8:12pm

AP Chemistry
The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 6.5 grams of manganese are oxidized by oxygen gas to Mn2O3 at standard state conditions? Answer in units of kJ
Thursday, October 24, 2013 at 7:19pm

chem
A 1L flask is filled with 1.25 g of argon at 25 degrees celcium. A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm. What is the partial pressure of argon in the flask? Chemistry - DrBob222, Tuesday, October 5, 2010 at 9:00pm mols Ar = 1....
Thursday, October 24, 2013 at 6:21pm

Chemistry
Identify the following chemical equations by type. 1. If an electric discharge produces 500 cm3 of ozone (O3), how many cm3 of oxygen (O2) are required? 3O2(g) ---> 2O3(g) 2. When 2.75 dm3 of O2 react with an excess of glucose (C6H12O2), according to the reaction below, ...
Thursday, October 24, 2013 at 11:40am

chemistry
Two 50mL beaker. One contains 50mL of 1.0M PbSO4 and the other contains 10mL of 0.1M Pb(NO3)2 added with 40mL of .10M KI. What is the Ksp of PbI2?
Thursday, October 24, 2013 at 3:47am

chemistry
Two 50mL beaker. One contains 50mL of 1.0M PbSO4 and the other contains 10mL of 0.1M Pb(NO3)2 added with 40mL of .10M KI. What is the Ksp of PbI2?
Thursday, October 24, 2013 at 3:47am

Chemistry
A 23.16 ml volume of an H2A acid solution of unknown concentration with 2 drops of phenolphthalein required 14.24 ml of 0.135 M NaOH to reach the endpoint. What is the molar concentration of the acid solution?
Thursday, October 24, 2013 at 1:04am

Chemistry
Which of the following compounds is neutral in aqueous solution? A. CaCl2 B. AlCl3 C. NH4Cl D. CaO E. Na2CO3 F. CO2
Thursday, October 24, 2013 at 1:04am

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