11.8 Tro's Introductory Chemistry, Chapter 11

Ideal Gas Law By combining the gas laws, we can write a general equation. R is called the Gas Constant. The value of R depends on the units of P and V. We will use 8.314 and convert P to kPa and V to L. Use the ideal gas law when you have a gas at one condition, use the combined gas law when you have a gas whose condition is changing. Tro's Introductory Chemistry, Chapter 11

Tro's Introductory Chemistry, Chapter 11 Calculate the Volume Occupied by 637 g of SO2 at 6.08 x 103 mmHg and –23 °C. Tro's Introductory Chemistry, Chapter 11 3

Tro's Introductory Chemistry, Chapter 11 Calculate the Density of a Gas at 775 torr and 27 °C if 0.250 moles Weighs 9.988 g. Tro's Introductory Chemistry, Chapter 11 4

Molar Mass of a Gas One of the methods chemists use to determine the molar mass of an unknown substance is to heat a weighed sample until it becomes a gas, measure the temperature, pressure, and volume, and use the ideal gas law. Tro's Introductory Chemistry, Chapter 11

Tro's Introductory Chemistry, Chapter 11 What Is the Molar Mass of a Gas if 12.0 g Occupies 197 L at 380 torr and 127 °C? Tro's Introductory Chemistry, Chapter 11 6