Under identical conditions, separate samples of o2 and an unknown gas were allowed to effuse through identical membranes simultaneously. after a certain amount of time, it was found that 4.644.64 ml of o2 had passed through the membrane, but only 3.123.12 ml of of the unknown gas had passed through. what is the molar mass of the unknown gas? unknown molar mass: g/mol

70.77 g/mol is the molar mass of the unknown gas.

Explanation:

Effusion is defined as rate of change of volume with respect to time.

Rate of Effusion=

Effusion rate of oxygen gas after time t =

Molar mass of oxygen gas = M = 32 g/mol

Effusion rate of unknown gas after time t =

Molar mass of unknown gas = M'

The rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

M' = 70.77 g/mol

70.77 g/mol is the molar mass of the unknown gas.

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