Partial pressure of `CH_(4)` gas in the mixture of `CH_(4)` & `He` gases in a flask is `0.5` atm. If that mixture is at STP, the weight of helium gas in the mixture is

Pressure contributed by an individual gas in a mixture of gases is called

In a mixture of gases, the volume content of a gas is 0.06% at STP. Calculate the number of molecules of the gas in 1 L of the mixture.

The total pressure of a mixture of oxygen and hydrogen is 1.0 atm. The mixture is ignited and the water is removed. The remaining gas is pure hydrogen and exerts a pressure of 0.40 atm when measured at the same values of T and V as the original mixture. What was the composition of the original mixture in mole fraction ?

A vessel of volume 20 L contains a mixture o hydrogen and helium at temperature of 27^(@)C and pressure 2.0 atm The mass of the mixture is 5 g . Assuming the gases to be ideal, the ratio of the mass of hydrogen to heat of helium in the given mixture will be