Asample of nitrogen gas is contaminated with a gas (gas a) of unknown molar mass. the partial pressure of each gas is known to be 200 torr at 25°c. the gases are allowed to effuse through a pinhole, and it is found that gas a escapes 2.65 times the rate of nitrogen gas. what is the molar mass of gas a?

Molar mass of gas A is 4.00 g/mol

Explanation:

Rate of effusion (r) is inversely proportional to molecular mass of the gas (M).

Therefore,

r1 = Rate of effusion of gas A

r2 = Rate of effusion of nitrogen gas

M1 = Molecular formula of gas A

M2 = Molecular formula of nitrogen gas = 28 g/mol

Given:

substitute the value in the formula,

Molar mass of gas A is 4.00 g/mol