Suppose that hydrochloric acid and aluminum are reacted to produce hydrogen gas. This hydrogen gas is collected by displacement of water at and a total pressure of . If the volume of the gas collected is , then how many moles of hydrogen were collected?

Note: The vapor pressure of water at is .

A 4.0 L container at 25 C is filled with 2.0 g neon and 8.0 g helium. What is the total pressure of the mixture?

A 2.0 L container at 20 oC contains a gaseous mixture of and He with a total pressure of 4 atm. The partial pressure exerted by He is 2.4 atm. How many moles of are in the container?

A mixture of helium, nitrogen, and neon has a total pressure of at a temperature of . If the partial pressure of helium is and the partial pressure of nitrogen is , what mass of neon is present in the mixture?