Gas Laws and Molar Calculations

The video provides solutions to a practice quiz on the ideal gas law and stoichiometry. It covers various problems involving gas calculations, including conversions, pressure, volume, and temperature. The video also explains balancing chemical equations and calculating molar mass and density. Each problem is solved step-by-step, with explanations of the concepts and calculations involved.

What is the pressure of oxygen gas in a flask if the volume is 3.75 liters, the temperature is 305 Kelvin, and the number of moles is 0.781?

• 3.75 atm

• 5.21 atm

• 4.50 atm

• 6.00 atm

How many moles of nitrogen gas are present in a balloon containing 125 grams of nitrogen?

• 6.00 moles

• 3.50 moles

• 5.00 moles

• 4.46 moles

What is the volume of helium gas if the pressure is in Torr and the number of moles is 1.58?

• 9.26 liters

• 7.50 liters

• 10.00 liters

• 8.00 liters

How many grams of carbon dioxide are present if the number of moles is 0.373?

• 16.4 grams

• 20.0 grams

• 14.0 grams

• 18.0 grams

What is the volume of 47.5 grams of ethylene gas at STP?

• 30.0 liters

• 40.0 liters

• 35.0 liters

• 37.9 liters

How many liters are there in one cubic meter?

• 2,000 liters

• 1,500 liters

• 500 liters

• 1,000 liters

What is the density of butane gas at STP in grams per liter?

• 2.59 g/L

• 3.00 g/L

• 2.00 g/L

• 2.80 g/L

What is the molar mass of a gas with a density of 2.32 grams per liter at STP?

• 52.0 g/mol

• 55.0 g/mol

• 60.0 g/mol

• 48.0 g/mol

How many molecules of oxygen are present in 27.5 milliliters of O2 at STP?

• 7.00 x 10^20

• 6.50 x 10^20

• 8.00 x 10^20

• 7.39 x 10^20

What is the molar mass of a gas if its mass is 26.5 grams and it occupies 4.25 liters at 275 kPa and 35°C?

• 58.1 g/mol

• 55.0 g/mol

• 50.0 g/mol

• 60.0 g/mol