6. Gas Law: Automobile Air Bags 6. Calculate the volume occupied by 25.2 g of Co

Question

6. Gas Law: Automobile Air Bags 6. Calculate the volume occupied by 25.2 g of CoO: at 0.84 atm and 25 C (R-0.08206 L atm/K mol). 7. A sample of nitrogen gas is confined to a 14.0 L container at 375 torr and 37 0°C. How many moles of nitrogen are in the container (R- 0.08206 L atm/K . mol, I acm-760 torr)? 8. Gases are sold in large cylinders for laboratory use. What pressure, in atmospheres, will be exerted by 2,500 g of oxygen gas (02) when stored at 22"C in a 40.0 L cylinder (R 0.08206 L·atm/K·mol)? A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm. What is the molar mass of the gas (R 0.08206L atm/K. mol)? 9.

Explanation / Answer

PV= nRT

P = Pressure in atm                       V= Volume in Liter

n = no of moles               R = 0.0821 L atm K-1 Mol-1

T = Temperature in Kelvin

Question 6  

25.2 gm CO2 = 25/44 = 0.5681 Moles

Volume Occupied = 0.5681 x 0.08206 x 298 / 0.84 = 16.54 Liter

Question 7

Pressure = 375 Torr = 375 / 760 = 0.493 atm

Moles of nitrogen = 0.493 x 14 / 0.08206 x 310 = 0.271 Moles

Question 8

2500 g of O2 = 2500 /32 = 78.125 Moles

Pressure = 78.125 x 0.08206 x 295 / 40 = 47.28 atm

Question 9

Moles of gas = 1 x 3.16 / 0.08206 x 305 = 0.12625 Moles

Molar mass = 9.33 / 0.12625 = 73.89 g/mol

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