1.How doesthe density ofa gasdepend on temperature?Pressure? How doesit depend on the molar massof the gas?
2.What is partial pressure?What is the relationship between the partial pressuresof each gas in a sample and the total pressure of gas in the sample?
3.Why do deep-sea divers breathe mixtureof heliumand orygen?
4.When a gas is collectedover water, is the gas pure?Why or why not? How can the partial pressureof the desiredgas be determined?