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.

The density of gas is 1.27 gL^(-1) at 50^@C and 0.987 xx 10^5 Pa. Calculate ist molar mass.

The density of phosphine gas is "1.27 g dm"^(-3) at 50^(@)C and 0.987xx10^(5)Pa. Calculate its molar mass.

The density of an ideal gas is 1.25xx10^(-3)g cm^(-3) at STP. Calculate the molecular weight of the gas.

The density of an unknown gas at 98^(@)C and 0.974atm is 2.5 xx10^(-3) g //ml . What is the mol.wt. of gas ?

If the density of a gas A is 1.5 times that of B, then the molecular mass of A is M. The molecular mass of B will be

1.40L of an unknown gas requires 57 second to diffuse and the same volume of N_(2) gas takes 84 second to diffuse at the same temperature and pressure. What is the molecular mass of the unknown gas?

Figure shows two flasks connected to each other. The volume of the flask 1 is twice that of flask 2 . The system is filled with an ideal gas at temperature 100 K and 200 K respectively. If the mass of the gas in 1 be m then what is the mass of the gas in flask 2