The mass of a 250 `cm^(3)` flask is 287 mg more when it is filled with an unknown gas than when it is evacuated. When the flask is filled, the gas is at `20^(@)C` and `1.00xx10^(5)` Pa. What is the molecular mass of the gas molecules.

9.00 litres of a gas at 16 atm and 27°C weigh 93.6 g. What is the molecular mass of the gas ?

If the value of Avogadro's number is changed to 1.0 xx 10^20 , what would be the molecular mass of nitrogen gas ?

A gas cylinder of capacity of 20 dm^(3) is filled with gas X, the mass of which is 10g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure, the mass of the hydrogen is 2g. Hence the relative molecular mass of the gas is

An evacuated glass vessel weight 50 g when empty and 148 g when filled with a liquid of density 0.98 g cc^(-1) and 50.5 g when filled with an ideal gas at 27^(@)C and 1 atm. Determine the molecular weight of the ideal gas.

2.5gms. of a gas is present in 750ml. flask at 32^@C and 770mm, of Hg pressure. Calculate the molecular mass of the gas.

The rate of diffusion of NH_3 is 3.32 times faster than that of an unknown gas when both gases are. at 350 K. The molecular weight of the unknown gas is :

Two flasks A and B of 1L each are filled with O_(2) and SO_(2) gas at 27^(@) C and 1 atm pressure. The flasks will contain .