A sample of N₂ gas is contaminated with a 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 at 4 times the rate of N₂.The molar mass of gas A is: A)1.75 g/mol B)112 g/mol C)7.01 g/mol D)448 g/mol E)none of these

Question

Quizplus · Accepted Answer

Graham's law of effusion states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass. Therefore, the molar mass of gas A is 4 times less than that of N2, which is 28 g/mol. Therefore, the molar mass of gas A is 7 g/mol.

A Sample of N2 Gas Is Contaminated with a Gas

A Sample of N₂ Gas Is Contaminated with a Gas