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December 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
Which of the following is generally defined as a substance composed of molecules in which two or more nonmetallic elements are joined? A. Binary compound B. Ionic compound C. Molecular compound D. Ternary compound I think A
Saturday, November 10, 2012 at 6:40pm

Chemistry
Describe nuclear fission and write a nuclear equation to describe the fission of U-235? Uranium-235 undergoes neutron-Induced fission to produce Xe-144 and Sr-90. Write a nuclear equation for the reaction. How many neutrons are produced?
Saturday, November 10, 2012 at 6:36pm

chemistry
When compared to compound B, compound A has lower melting and boiling points and vaporizes more readily. Is compound A an ionic compound or a molecular compound? A. Ionic B. Molecular I say B
Saturday, November 10, 2012 at 6:35pm

chemistry
Which of the following consists of positive and negative ions bound together and held in place in a crystalline solid? A. Covalent bonds B. Ionic compounds C. Molecular compounds D. Molecules I say B
Saturday, November 10, 2012 at 6:27pm

chemistry
Is diphosphorus pentoxide an ionic or a molecular compound? A. Ionic B. Molecular I say B
Saturday, November 10, 2012 at 6:23pm

chemistry
Which phase of ionic compounds are good electrical conductors because the ions are free to carry electrical current? A. Solid B. Liquid C. Gas D. Crystalline I say B
Saturday, November 10, 2012 at 6:14pm

chemistry
Just wanted to say thank you very much for the help I got from everybody :)
Saturday, November 10, 2012 at 5:04pm

Chemistry
I want to be a pharmacist what route do I take? Do I go to premed or....I am confused!
Saturday, November 10, 2012 at 4:12pm

chemistry
Which ion is absorbed by a base in water? A. H3O+ B. OH- C. Neutron D. Transition metal B
Saturday, November 10, 2012 at 3:56pm

chemistry
how many liters of hydrogen gas can be formed at 722 mmHg at 15 degress C when 5.5 grams of zinc metal with 150 mL of 1.25 molarity HCl solution?
Saturday, November 10, 2012 at 3:51pm

chemistry
Which of the following does NOT belong with the others? A. HNO3 B. H2SO4 C. H2CO3 D. OH- I think D
Saturday, November 10, 2012 at 3:48pm

chemistry
What is a special group of compounds that produce H+ ions when dissolved in water? A. Acids B. Ionic compounds C. Molecular compounds D. Polyatomic compounds I think A
Saturday, November 10, 2012 at 3:38pm

chemistry
Which of the following is true of a substance with a pH of 11.0? A. The substance is an acid. B. The substance is a base. C. The substance is neutral. D. The substance is a transition metal. I think A
Saturday, November 10, 2012 at 3:28pm

chemistry
What is usually indicated by an -ite or -ate ending in a chemical formula? A. The compound carries a net ionic charge of zero. B. The compound contains a polyatomic ion. C. The compound is an acid. D. The compound is molecular. I think A
Saturday, November 10, 2012 at 2:53pm

chemistry
_A2(SO3)3+_NaOH->_Na2SO3+_Al(OH)3 if you start with 389.4 g of Al2(SO3)3 and you produce 212.4 g of Na2SO3, what is your percent yield for this reaction?
Saturday, November 10, 2012 at 2:34pm

chemistry
_H3PO4+_KOH->_K3PO4+_H2O if 49.0 g of H3PO4 is reacted with excess KOH, determind the percent yield of K3PO4 if you produce 49.0 g of K3PO4.
Saturday, November 10, 2012 at 2:32pm

chemistry
1K2PtCl4+2(NH3)->1Pt(NH3)2Cl2+2KCl what is the percent yield, when 34.5 grams of NH3 react with excess K2PtCl4 if 76.4 g of Pt(NH3)2Cl2 are actually produced?
Saturday, November 10, 2012 at 2:30pm

chemistry
Which of the following does NOT belong with the others? A. HCl B. HNO3 C. H2O2 D. H3PO4 I say A
Saturday, November 10, 2012 at 1:04pm

chemistry
The chemical formula CCl4 tells us that there are a total of how many atoms in each molecule of the compound? A. 2 B. 3 C. 4 D. 5 I say D
Saturday, November 10, 2012 at 1:03pm

chemistry
How many atoms of nitrogen are in the chemical formula N2O? A. 1 B. 2 C. 3 D. 4 I say A
Saturday, November 10, 2012 at 12:28pm

chemistry
2. Sulfuric acid comes from the oxidation of sulfur. The stages of the reactions are given below: S + O2 --> SO2 ∆H= -296.8 kj SO2 + 1/2 O2 --> SO3 ∆H= -98.9 kj SO3 + H2O --> H2SO4 ∆H= -130.0 kj The typical plant produces 750 tons of H2SO4 per day. ...
Saturday, November 10, 2012 at 9:00am

Chemistry
Each of 2 front tires in the car is filled with a different gas. One tire contains 116 g of helium, another tire has 160 g of unknown gas. How many times heavier is a molecule of the unknown gas than an atom of helium?
Saturday, November 10, 2012 at 8:59am

chemistry
a photon has 3.3 *10-19 joules of energy. what is the wavelength of this photon?
Friday, November 9, 2012 at 7:57pm

chemistry
What is pH of 0.1M solution of NH4Br, if the pKb of NH3 is 4.74?
Friday, November 9, 2012 at 5:58pm

chemistry
A polyatomic ion is a tightly bound group of atoms that carries its own unique charge. True False I say true
Friday, November 9, 2012 at 2:28pm

chemistry
The hydrogen carbonate ion is formed when an H+ ion combines with the polyatomic ion CO32-. What is the net charge on the hydrogen carbonate ion? A. 2- B. 1- C. 1+ D. 2+ A
Friday, November 9, 2012 at 2:20pm

chemistry
The calcium ion carries a charge of 2+. The nitrate ion (NO3-) carries a charge of 1-. Which of the following is the correct formula for calcium nitrate? A. CaN2 B. CaNi C. CaNO3 D. Ca(NO3)2 C
Friday, November 9, 2012 at 1:51pm

chemistry
what elements follow the octet rule?
Friday, November 9, 2012 at 1:41pm

Chemistry
A 1.30-L sample of argon gas is at 1.02 atm and 21.5 degrees Celsius. a. what mass of argon is in the container. b. If the temperature is raised to 500 degrees celsius while the volume remains constant, calculate the new pressure, in stmospheres.
Friday, November 9, 2012 at 1:11pm

Chemistry
Discuss the effect of the 'extra' hydroxyl groups on the physical properties of diols and triols, compared to alkanols that have only one hydroxyl group. HINT: Consider the polar nature of the hydroxyl group Really need help for this!!!
Friday, November 9, 2012 at 5:01am

Chemistry
The normal freezing point of cyclohexane is 6.55 C. When 0.458 g of benzophenone is dissolved in 15.0 g of cyclohexane, the freezing point is found to be 3.19 C. What is the experimental molar mass of benzophenone? (Kf cyclohexane = 20.0 C m^-1). A) 182 B) 866 C) 397 D) 191 (...
Friday, November 9, 2012 at 1:03am

chemistry
Consider the following reaction: 2H2 (g) + O2 (g)  2H2O (l) ΔH = -572 kJ a. How much heat is evolved for the production of 1.00 mol H2O (l)? b. How much heat is evolved when 4.03 g hydrogen is reacted with excess oxygen? c. How much heat is evolved when 186 g ...
Friday, November 9, 2012 at 12:59am

Chemistry
Consider the reaction: CO(g) + H2O (g) <---> CO2(g)+H2(g) which of the following initial composition will NOT achieve equlibrium? a) 0.25 mol H2, 0.35 mol CO2, and 0.25 mol CO b) 0.25 mol CO, 0.75 mol H2O c) 1.0 mol of CO2 and 0.50 mol H2 d) 0.85 mol CO and 0.25 mol H2 ...
Friday, November 9, 2012 at 12:32am

chemistry
balanced equation for potassium nitrate(s)--->potassium nitrate(s)+oxygen(g)
Thursday, November 8, 2012 at 10:32pm

chemistry
when Zn0 becames Zn++, where do the 2 electrons that are lost come from?
Thursday, November 8, 2012 at 10:29pm

Chemistry
For which of the following aqueous salts will electrolysis produce hydrogen gas and oxygen gas? Answered the hint in Mastering Chem & looked over the book and I still have no idea. Check all that apply: A) NiF_2(aq) B) NaF(aq) C) NiI_2(aq) D) NaI(aq) E) CuBr(aq)
Thursday, November 8, 2012 at 10:23pm

chemistry
1 2Mg + o2 --> 2Mgo 2 MgCo3 --> MgO + Co2 3 Co2 + Ca(OH)2 --> CaCo3 + h2O 4 Zn + 2HCl --> ZnCl2 + H2 5 2H2 + O2 ---> 2H2O 2 KI + Pb(NO3)2 --> 2KNO3 + PbI2 endothermic is absorbs energy. exothermic is releases energy. which of those reaction are endothermic? ...
Thursday, November 8, 2012 at 10:23pm

Chemistry
51.34 g of water at 81.5 oC is added to a calorimeter that contains 52.13 g of water at 40.7 oC. If the final temperature of the system is 59.4 oC, what is the calorimeter constant (Ccalorimeter) ? Use 4.184 J/goC for the heat capacity of water.
Thursday, November 8, 2012 at 9:46pm

Chemistry
Pentane is a small liquid hydrocarbon, between propane and gasoline in size C5H12. The density of pentane is 0.626g/ml and its enthalpy of combustion is ΔHcomb =-3535kj/mol. Estimate the fuel valve and the fuel density of pentane.
Thursday, November 8, 2012 at 8:05pm

Chemistry
Calculate the final temperature of a mixture of 200.0g of ice initially at -16.5 Celsius and 406.0g of water initially at 84.5 degrees Celsius.
Thursday, November 8, 2012 at 8:00pm

Chemistry
The flame in a torch used to cut metal is produced by burning acetylene(C2H2) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251kj of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 36.658 x 10^4 kj of heat?
Thursday, November 8, 2012 at 7:58pm

chemistry
I need help with this lab. Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate: 93.000g Mass of crucible and pure salt: 91.196g I need to calculate the following: 1. mass of water in hydrate sample(g) 2. number of moles of water ...
Thursday, November 8, 2012 at 7:42pm

Chemistry
Please write the balanced chemical equation for reaction the following chemical reaction ozone gas, O3, reacts with 3,3,4,4,5,5-hexanmethyl-1-hexyne, H-C≡C-C(CH3)2-C(CH3)2-C(CH3)2-CH3 to produce carbon dioxide gas, CO2 , and water gas, H2O When balancing the equation , ...
Thursday, November 8, 2012 at 7:32pm

chemistry
the specific heat capacity of iron metal is 0.450 j/gk. how many joules of energy are needed to warm 1.31 g of iron from 20.00 C to 29.00 C?
Thursday, November 8, 2012 at 6:32pm

Chemistry
A small crack is present in the rubber stopper. How does this affect the calculated molar volume of the CO2? *experiment deals with carbonate analysis;molar volume of carbon dioxide
Thursday, November 8, 2012 at 5:14pm

Chemistry
find the volume of 56.4 g of a substance that has a density of 2.42 g/mL
Thursday, November 8, 2012 at 5:11pm

Chemistry
15.8 grams of potassium chlorate is decompossed and the gas is colected over water at 29 degrees celcius when water vapor pressure is 30 mmHg. Assuming 100% yeild of products, what is the total pressure in the vessel after the reaction in complete?
Thursday, November 8, 2012 at 4:36pm

Chemistry
Methanol is an organic solvent and is also used as fuel in some automobile engines. From the following data, calculate the standard enthalpy of formation of methanol. 2CH3OH + 3O2 --> 2CO2 + 4H2O, (delta H = -1452.8 kJ/mol
Thursday, November 8, 2012 at 4:18pm

Chemistry
If 0.10 mg Fe is diluted in a 50 mL flask, what is the concentration of the resulting solution? What volume of the resulting solution is needed to prepare 25.0 mL of a dilute sample solution with a concentration of 0.30 ppm Fe?
Thursday, November 8, 2012 at 1:58pm

chemistry
What does 0.540g of bromine and 0.858g of iodine yield
Thursday, November 8, 2012 at 1:19pm

Chemistry
An element has a body centred cubic structure with edge cell of 288 pm .The density of the element is 7.2 g/cm3.How many atoms are present in 208g of the element.
Thursday, November 8, 2012 at 12:56pm

Organic chemistry
Help me find my percent yield for my witting reaction experiment.... The weight of my final product was: 0.13 I put 0.40 g of benzyltriphenylphosphonium chloride, 0.23 g of 9-anthraldehyde and 1.0ml DMF and 0.5ml of aqueous sodium hydroxide into the flask at the start of the ...
Thursday, November 8, 2012 at 11:34am

Chemistry
Help me find my percent yield for my witting reaction experiment.... The weight of my final product was: 0.13 I put 0.40 g of benzyltriphenylphosphonium chloride, 0.23 g of 9-anthraldehyde and 1.0ml DMF and 0.5ml of aqueous sodium hydroxide into the flask at the start of the ...
Thursday, November 8, 2012 at 11:03am

Chemistry
for a question it is given that there is 14.6 g of calcium chloride in 246 g of water. Kf is 1.86 C/m we need to find the freezing point of this solution. when i do the calculations, i get the freezing point to be -0.99 (without using the vant hoff factor i) or i get -2.98 (...
Thursday, November 8, 2012 at 10:58am

Organic Chemistry
Why does crotyl chloride react faster than 1-chlorobutane in ethanol, since both are primary alkyl halides?
Thursday, November 8, 2012 at 10:57am

Chemistry
The high acid rain which falls in the Northeast frees aluminum ions from the soils. The tree absorbs the aluminium ion. The sap is basic so the aluminium ion becomes aluminum hydroxide. Aluminium hydroxide is a large bulky molecule that plugs the water/nutrient transport ...
Thursday, November 8, 2012 at 10:29am

Chemistry (henry's law and IGL)
Can Henry's Law be used for gases that obey the Ideal Gas Law? What about gases that do not obey the ideal gas law? when can you use/Not use henry's law?
Thursday, November 8, 2012 at 10:14am

chemistry
an unknown element crystallizes in a face-centered cubic unit cell. with an edge length of 392.4 pm. The solid has a density of 21.09 g/cm^3. what is atomic weight of solid? so what i did was : FC cubic uit --> 4 atoms edge length--> l = 2*root2*r = 392.4 pm = 392.4 * 10...
Thursday, November 8, 2012 at 9:16am

chemistry
A 0.2053g sample of an organic acid requires by titration, 15.0 mL of 0.1008 M sodium hydroxide for complete neutralization. i)what the molar mass of the acid if it is monoprotic? ii)if the acid is composed of 5.89% H,70.6% C, and 23.5% O by mass, what is its molecular formula?
Thursday, November 8, 2012 at 3:29am

Science- Chemistry
How do I figure these out? A solution of sodium thiosulfate, Na2S2O3, is 0.1365 M. 29.28 mL of this solution reacts with 39.79 mL of I2 solution. What is the molarity of the I2 solution? 2(Na2S2O3) + I2↔Na2S4O6 + 2(NaI) 16.77 mL of the I2 solution from above is required...
Thursday, November 8, 2012 at 1:48am

chemistry
A scientist isolates a gaseous compound. Is the compound ionic or covalent? Why?
Thursday, November 8, 2012 at 1:06am

Chemistry
How do I change 3,3,4,4,5,5-hexamethyl-1-hexyne into it's molecular formula
Thursday, November 8, 2012 at 12:55am

Chemistry
Consider the reaction 2H2O(g) --> 2H2(g) + O2(g) deltaH = +483.6 kJ/mol at a certain temperature. If the increase in volume is 32.7 L against an external pressure of 1.00 atm, calculate deltaU for the reaction. (1 L * atm = 101.3 J)
Thursday, November 8, 2012 at 12:08am

chemistry
A constant pressure tank is filled with air at 16.7 Atm at 24C it warms to 65C, what is the tank pressure
Wednesday, November 7, 2012 at 11:29pm

Chemistry Bobpursley
Please choose the correct option to complete the following statements. (6 marks) a) If a large amount of base is added to water, the pH of resulting solution would most likely Increase/decrease/remain the same Explain your choice b) If a small amount of acid is added to a ...
Wednesday, November 7, 2012 at 10:08pm

Chemistry
The following questions relate to acid base reactions. a) What type of reaction is said to occur when an acid reacts with a base.? ……………… ​3;…………… b) What are the general products of such a reaction? i.e. An acid...
Wednesday, November 7, 2012 at 9:37pm

Chemistry
If an object weighs 1.32 g/mL will it float or sink in water?
Wednesday, November 7, 2012 at 9:16pm

Chemistry
Please choose the correct option to complete the following statements. (6 marks) a) If a large amount of base is added to water, the pH of resulting solution would most likely Increase/decrease/remain the same Explain your choice b) If a small amount of acid is added to a ...
Wednesday, November 7, 2012 at 7:17pm

Chemistry
What volume of a 0.5 M solution is required to prepare 250 mL of a 0.15M solution? (Note: M = mole per Litre)
Wednesday, November 7, 2012 at 7:15pm

Chemistry
What role does a catalyst play in a chemical reaction in terms of rate and yield
Wednesday, November 7, 2012 at 7:08pm

chemistry
If a saline solution has a concentration of 0.25 g per mL, calculate the following. a) The concentration of this solution in %w/v. b) The concentration of this solution in grams per litre (g/L). c) The concentration of this solution in milligrams per mL (mg/mL).
Wednesday, November 7, 2012 at 6:10pm

Chemistry
if 3.00 g of iron metal are reacted in a calorimeter with a heat capacity of 500 J/ degrees Celsius, what would be the final temperature of the calorimeter if its initial temperature were 23.0 C?
Wednesday, November 7, 2012 at 5:41pm

Chemistry
if 3.00 g of iron metal are reacted in a calorimeter with a heat capacity of 500 J/ degrees Celsius, what would be the final temperature of the calorimeter if its initial temperature were 23.0 C?
Wednesday, November 7, 2012 at 5:11pm

Chemistry
I am stuggling with my chemistry experiment. I am given thr following: The reaction of citric acid and sodium bicarbonate is written as H3C6H5O7(aq) + 3NaHCO3(aq) --> Na3C6H5O7(aq) + 3H2O(l) + 3CO2(g) 1.) Mass of cup A, water, and stirrer = 54.3 g 2.) Mass of sodium ...
Wednesday, November 7, 2012 at 4:21pm

Chemistry
If we have solution of 4g CH3COONa and 4g NaOH obtained NaCl with efficiency 90% we have to calculate pH oh Nacl and we know that Ka= 1.8x10ˆ-5. Pleas help me i have exam tnext weak Im strudent but I dont undestant this???
Wednesday, November 7, 2012 at 3:31pm

Chemistry
550 mL of Ar at 632mm Hg will occupy what volume at 750mm Hg with the temperature remaining constant?
Wednesday, November 7, 2012 at 3:12pm

Chemistry
Find the energy( in KJ) of a wave with the wavelength of 507 nm. First, I turn the 507 nm into meter then divide the speed of light by it which give me the frequency. Then I take the frequency and multiply by the planck. Then I would convert the Joule to KiloJoule.- Would this...
Wednesday, November 7, 2012 at 2:36pm

Chemistry
Energy Level Transfer of Hydrogen's electron. For each line, determine the prinicpal energy level to which hydrogen's electron was excited. When the electron fell to the 2nd level, energy was released corresponding to each of the lines. E= 2.179X10-18 (1/n2 lo- 1/n2 hi...
Wednesday, November 7, 2012 at 2:33pm

chemistry
Suppose you have 0.500 M sucrose stock solution. How do you prepare 250 mL of 0.348 M sucrose solution ?
Wednesday, November 7, 2012 at 2:18pm

chemistry
A chemical reaction in a bomb calorimeter evolves 3.86 kJ of energy in the form of heat. If the temperature of the bomb calorimeter increases by 4.17 K, what is the heat capacity of the calorimeter?
Wednesday, November 7, 2012 at 2:08pm

Chemistry
For each of the bonds listed below use hybridized orbitals to classify the type of sigma bond that is formed between the two atoms. a) The sigma bond between boron and hydrogen in BH3 answer: sp^2 - p b) the sigma bond between S and fluoride in SF4. answer: sp^3d - p I ...
Wednesday, November 7, 2012 at 1:10pm

chemistry
A buffer system is created by neutralizing the supernatant solution containing Pb^2+, Fe^3+, Al^3+, Ca^2+, Cu^2+, and K^+ ions with 6M NH3 solution and then adding an equal volume of 6M NH3 solution. Explain what forms of 6M NH3 were present in the final solution, their ...
Wednesday, November 7, 2012 at 12:35pm

General Chemistry.
The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.765 and the molar absorptivity coefficient is 86,300 M–1cm–1. The molecular weight for chlorophyll a is 893.49 g/...
Wednesday, November 7, 2012 at 3:21am

Chemistry
what mass of nitrogen dioxide (8NO2) will form by reaction of 3.50 mole of perchloric acid (13HClO4) with excess methylamine (8CH3NH2)? Answer is 99.1 g. How do you work this?
Tuesday, November 6, 2012 at 11:46pm

Chemistry
what mass of water will be formed by reaction of 3.50g of methylamine (8CH3NH2) with 15.0g of perchloric acid (13HClO4)? Answer is 99.1. How do you work this?
Tuesday, November 6, 2012 at 11:43pm

chemistry
An ideal gas in a sealed container has an initial volume of 2.50 L. At constant pressure, it is cooled to 14.00 °C where its final volume is 1.85 L. What was the initial temperature?
Tuesday, November 6, 2012 at 9:56pm

chemistry 30 concentration of a product
calculate the concentration of the products of the following equilibrium when the equilibrium constant is 12.3 and the equilibrium concentration of nobr2 is 2.17 mol/l
Tuesday, November 6, 2012 at 9:18pm

chemistry
a pressure of 96.5Kpa is exerted by a mixture of nitrogen gas and water vapor in a equilibrium with liquid water at 18 degree celcius , what is the partial pressure exerted by the nitrogen gas?
Tuesday, November 6, 2012 at 8:48pm

CHEMISTRY: URGENT
1) the element Q has the electronic configuration 1S2, 2S2, 2p6, 3s2, 3p6, 4s2 3d10, 4p1. Write the atomic #. Q exist as 69Q and 71Q. What is the significance of the 2 #'s. What does it mean. B) find the atomic mass if 69Q is 60% anf 71Q is 40%
Tuesday, November 6, 2012 at 8:36pm

Chemistry
Aspirin is prepared by heating salicylic acid, C7H6O3, with acetic anhydride, C4H603. The other product produced is acetic acid, C2H402. C7H6O3+C4H6)3->C9H8O4+C2H4O2 What is the theoretical yield in grams of aspirin, C9H8O4, when 2.00 grams of salicylic acid is heated with ...
Tuesday, November 6, 2012 at 8:00pm

Chemistry
Given the information below, calculate the heat provided by combustion of 66.1g of propane (C3H8). ΔHf° (C3H8(g)) = -103.85 kJ ΔHf° (CO2(g)) = -393.5 kJ ΔHf° (H2O(ℓ)) = -285.8 kJ Can Someone explain this in detail? i have to answer this type of...
Tuesday, November 6, 2012 at 5:50pm

Chemistry
How would I go about creating a Lewis Dot structure for the Calcium Carbonate and Magnesium Hydroxide? I know how to do it for any compound with two elements such as SF5, but I don't know how to approach it when there's a polyatomic ion involved and there are three ...
Tuesday, November 6, 2012 at 5:47pm

chemistry
Consider the equation: 2NO2(g) N2O4(g). Using ONLY the information given by the equation which of the following changes would increase the molar concentration at equilibrium of the product N2O4(g)?
Tuesday, November 6, 2012 at 4:28pm

Chemistry
If a .01M Mn(NO3)2 solution has an ammonia concentration of 6M, would a precipitate form? Calculate the ion product and compare to Ksp. I'm way too confused. I'm pretty sure a precipitate would form so I set up an ice table but don't know where to go from there? ...
Tuesday, November 6, 2012 at 2:45pm

Chemistry
Which of the following will result in a chemical change?
Tuesday, November 6, 2012 at 2:17pm

Chemistry
The density of ethane, C2H6, at 25 oC and 1.10 atm is ___________.
Tuesday, November 6, 2012 at 2:05pm

Chemistry
A sample of hydrogen is collected over water at a total pressure of 648 mm Hg at 22 oC. The vapor pressure of water at 22 oC is 19.8 mm Hg. The partial pressure of the hydrogen is __________.
Tuesday, November 6, 2012 at 2:05pm

Chemistry
The combustion of ethane: 2 C2H6 (g) + 7 O2 (g) ---> 4 CO2 (g) + 6 H2O (g) At teh same temperature and pressure, what is the maximum volume in liters of carbon dioxide that can be obtained from 15.9 L of ethane and 52.3 L of oxygen?
Tuesday, November 6, 2012 at 2:04pm

Chemistry
The gas sulfur dioxide, SO2, oxidizes to form another gas, sulfur trioxide, SO3. How many oxygen atoms are present in 3.20 g of sulfir trioxide?
Tuesday, November 6, 2012 at 2:03pm

Chemistry
Which of the following gases will effuse through a hole in a balloon fastest? a.Kr b.NO c.N2O d.NO2 e.ArNO2
Tuesday, November 6, 2012 at 12:37pm

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