Tianya O STATES OF MATTER Using the combined gas law For many purposes we can treat propane (CH) as an ideal gas at temperatures above its boiling point of - 42. c. Suppose the temperature of a sample of propane gas is lowered from 18.0 C to - 170 C, and at the same time the pressure is changed. If the initial pressure was 0.11 kPa and the volume decreased by 45.0%, what is the final pressure? Round your answer to 2 significant digits. X