The Ideal Gas Law

The Ideal Gas Law

Learning Objectives

• Describe and solve for the molar volume of a gas.

• Identify the properties of gases.

• State and use the general gas equation pV = nRT in calculations, including the determination of M_r

Multiple Choice

What is the variable for this number 122 K

• P

• n

• T

• V

Multiple Choice

What is the variable for this number 9.10 atm

• P

• V

• n

• T

Multiple Choice

What is the variable for this number 32^oC

• P

• n

• V

• T

Multiple Choice

What is the variable for this number 22.4 L

• P

• n

• V

• T

Multiple Choice

A sample of carbon dioxide at STP is 0.50 L. How many grams of carbon dioxide do we have?

• 0.48 g

• 0.49 g

• 1.96 g

• 0.98 g

Multiple Choice

A 2.00 L sample of pure oxygen gas (O₂) is measured at STP. How many moles of oxygen is this?

• 24.4 mol

• 0.007 mol

• 1.44 mol

• 0.09 mol

The most common example is the molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.

One mole of any gas has a volume of 24 Liters or 24,000 cm³ at rtp (room temperature and pressure) 1 mole of any ideal gas at a temperature equal to 298 K and a pressure equal to 1.00 atm.

How is the number of moles in a gas at other temperatures and pressures calculated?

Ideal gas equation

The ideal gas equation relates pressure, volume, number of moles and temperature for a gas.

The General Gas Equation

Multiple Choice

What pressure, in atm, is exerted by 2.50 L of gas containing 1.35 mol at 320 K?

• 14.19 atm

• 16.53 atm

• 18.42 atm

• 22.54 atm

Multiple Choice

Determine the Celsius temperature of 2.49 moles of gas contained in a 1.00-L vessel at a pressure of 143 kPa.

• -266 ^oC

• -622 ^oC

• 622 ^oC

• 266 ^oC

Multiple Choice

Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.

• 7.18 L

• 7.81 L

• 4.63 L

• 4.36 L

Poll

This lesson is so easy to understand!!!

• I strongly agree.

• I agree.

• I neither agree nor disagree.

• I disagree.

• I strongly disagree.