Applications of the Gas Laws (5.2.3)

Question 1

What must be taken into account when determining the number of moles of gas collected over water?

Answer 1

• When determining the number of moles of gas collected over water, the partial pressure of water vapor in the gas sample must be taken into account.

Question 2

Why do helium balloons and hot air balloons float?

Answer 2

• Helium balloons and hot air balloons float because the gas contained within them has a lower density than the atmosphere.