Question

1. A helium-filled weather balloon has a volume of 558 L at 22.9°C and 751 mmHg. It is released and rises to an altitude of 3.13 km, where the pressure is 582 mmHg and the temperature is 1.9°C.

The volume of the balloon at this altitude is ____L.

2. A sample of helium gas collected at a pressure of 1.42 atm and a temperature of 17.0 °C is found to occupy a volume of 22.9 liters. How many moles of He gas are in the sample? ______mol

3. A sample of krypton gas collected at a pressure of 1.06 atm and a temperature of 288 K is found to occupy a volume of 752 milliliters. How many moles of Kr gas are in the sample? _____mol

4. A sample of helium gas at a pressure of 935 mm Hg and a temperature of 40 °C, occupies a volume of 7.25 liters. If the gas is heated at constant pressure to a temperature of 74 °C, the volume of the gas sample will be _____ L.