How many molecules of N_2 are present in a 400.0 mL container at 780 mm Hg and 135°C? (Use R = 0.0821 L·atm·mol^{-1}·K^{-1} and 1 atm = 760 mm Hg.)

A student collects a gas over water using a eudiometer. The atmospheric pressure is 1.00 atm, and the height difference between the water levels inside and outside the eudiometer is negligible. What is the pressure of the collected gas (pgas)?

What is the mass of 8.55 L of phosphine gas (PH_3) at STP? Round your answer to 3 significant figures.

Using the ideal gas law, what is the pressure (in atm) in a 5.80 L container that contains 0.545 moles of oxygen gas at 22.0 °C?

Using the ideal gas law, what is the temperature (in K) of 0.300 mole of neon gas in a 2.00 L vessel at 4.68 atm?

A 5.00 L tank contains carbon monoxide (CO) gas at a temperature of 155 °C and a pressure of 2.80 atm. Using the ideal gas law, how many moles of CO are present in the tank?

A 9.00 L tank contains 75.1 grams of fluorine gas (F_2) at a temperature of 355 K. What is the pressure inside the tank? (R = 0.0821 L·atm·mol^{-1}·K^{-1})

Using the ideal gas law, what pressure (in atm) will be exerted by 1.5 moles of neon gas occupying 5.0 L at 273 K?

How many molecules of O_2 occupy a volume of 1.0 L at 65 °C and 778 mm Hg? (Use R = 0.0821 L·atm·mol^{-1}·K^{-1} and 1 atm = 760 mm Hg.)