Standard Temperature and Pressure Practice Problems

At STP, a container is filled with gas to an initial volume of 3.50 L. The temperature was increased to 115°C and the container was allowed to expand to a volume of 50.0 L. Calculate the final pressure, in millimeters of mercury, of the gas in the container.

A diving cylinder has an air capacity of 3.50 L at STP. Calculate the mass of oxygen in grams present in the cylinder at STP if it contains 18.0% oxygen.

At STP, a sample of a gas occupies a volume of 1.63 L. Determine the temperature at which the gas occupies a volume of 6.35 L at 422 mmHg.

Identify the sample which contains more molecules: a 1.5 L sample of N₂ at STP or a 2.2 L sample of C₂H₂ at 60 ºC and 1.8 atm.

Calculate the mass of ethane (C₂H₆) at STP with a volume of 11.3 L.

How many grams and molecules are present in 1.5 L of H₂ at STP?

The definition of standard conditions (STP) is

At STP, what is the volume occupied by 33.5 g of argon gas?

What would be the density of oxygen, O₂, at each condition?

a) STP

b) 1.56 atm and 66.0°C

Answer in grams per liter.

Oxygen gas reacts with methane (CH₄) to produce carbon dioxide and water. 

Calculate the moles of O₂ required to completely react with 121.0 L of methane at STP

A gaseous hydrocarbon sample has a volume of 396 mL and weighs 0.780 g at STP.

Identify the molecular formula given that it's 81.68 % C and 18.32 % H by mass.