Name....aten ANSWER ONLY FIVE OF THE FOLLOWING SEVEN QUESTIONS 1. A volume of ca

Question

Name....aten ANSWER ONLY FIVE OF THE FOLLOWING SEVEN QUESTIONS 1. A volume of carbon dioxide gas,COz, equal to 20.4 L, was collected at 23C and 1 atm pressure. What would be the volume of carbon dioxide collected at 23 ° C and 0.750 atm? 2. What is the pressure in a 49.0-L gas cylinder that contains 3.03 kg of oxygen, 02, at 23°C? 3. What is the total pressure (in atm.) of a mixture of 0.02000 mol He and 0.03000 mol Ha gases in a 4. Helium gas and another noble gas have a ratio of their rates of effusion of 5.73 to 1. What is the molecular weight and name of the other noble gas? Show your work!!! Given that 4NHs (9)+ 302 (9)2N2 (g) + 6H20 (g); delta H-1267 kJ 5.

Explanation / Answer

Q1)

Using ideal gas equation

PV = nRT

1 * 20.4 = n * 0.0821 * (273+23)

n = 0.83945 mol

Again using ideal gas equation

0.750 * V = 0.83945 * 0.0821 * (273+23)

V = 27.2 L

Q2)

Using ideal gas equation

PV = nRT

number of moles = Mass/molar mass of O2 = 3030/32 = 94.6875 mol

P * 49 = 94.6875 * 0.0821 * (273+23)

P = 46.960 atm

3)

Using ideal gas equation

PV = nRT

P * 3 = (0.02+0.03) * 0.0821 * (273+20)

P = 0.4009 atm

4)

Effusion rate is directly proportional to 1/sqrt(M)

Mass of noble gas unknown = Mass of helium gas * (5.73/1)^2 = 131.397 gm/mol

The gas will be Xenon (Xe)

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