Helium has a rate of effusion ____________ that of O2.

A mixture of helium and nitrogen gases is maintained in a 5.66 L flask at a pressure of 1.31 atm and a temperature of 20 °C. If the gas mixture contains 0.863 grams of helium, the number of grams of nitrogen in the mixture is _______ g.

A sample of Ne gas is observed to effuse through a pourous barrier in 3.63 minutes. Under the same conditions, the same number of moles of an unknown gas requires 5.39 minutes to effuse through the same barrier. The molar mass of the unknown gas is ________  g/mol.

A 1.22 gram sample of an unknown gas is found to occupy a volume of 1.13 L at a pressure of 441 mmHg and a temperature of 45 °C. Assume ideal behavior. The molar mass of the unknown gas is  __________g/mol.

A The rate of effusion of a particular gas was measured to be 27.0 mL/min. under the same conditions, the rate effusion of pure methane gas (CH4) is 45.2 mL/min. What is the molar mass of the unknown gas? Answer to 1 decimal place. Your Answer: Answer units

An 1.09 mol sample of oxygen gas at a temperature of 25.0°C is found to occupy a volume of 26.3 liters. The pressure of this gas is _________ atm

A 19.6-L tank is filled with H2 to a pressure of 245 atm. How many balloons (each 2.00 L) can be inflated to a pressure of 1.00 atm from the tank? Assume the ideal gas behavior, that there is no temperature change, and that the tank cannot be emptied below 1.00 atm pressure.  _____ balloon(s)

In the open ended manometer (open to the atmosphere) pictured below, what is the pressure of the gas in the bulb if the pressure of the atmosphere is 755 mm Hg and h = 55 mm Hg? Input your answer in mm Hg.

The rms speed of methane molecules at 45.0 °C is ______ m/sec.