Answer to Question #319251 in General Chemistry for Karolyn

Question

A. A sample of helium gas at a pressure of 0.774 atm and a temperature of 259 °C, occupies a volume of 512 mL. If the gas is heated at constant pressure until it’s volume is 745 mL, the temperature of the gas sample will be _______ °C.

B. A sample of krypton gas at a pressure of 964 mm Hg and a temperature of 38 °C, occupies a volume of 13.8 liters. If the gas is cooled at constant pressure to a temperature of 8°C, the volume of the gas sample will be ______ L.

Answer 1

The equations describing these laws are special cases of the ideal gas law, PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (universal) gas constant

Gay--Lussac's gas law will be used to solve this problem. It states that the pressure of a gas is directly proportional to its Kelvin temperature, as long as mass and volume are held constant. This means that if the volume increases, so does the temperature and vice-versa.