At a given temperature, the rate at which bromine gas effuses is _______ times the rate of helium gas.

Question

Quizplus · Accepted Answer

The rate of effusion of a gas is inversely proportional to the square root of its molar mass (Graham's law of effusion). The molar mass of bromine (Br2) is approximately 160 g/mol, and the molar mass of helium (He) is about 4 g/mol. Using the formula rate1/rate2 = sqrt(M2/M1), where M1 and M2 are the molar masses of helium and bromine, respectively, we get rateHe/rateBr2 = sqrt(160/4) = sqrt(40) ≈ 6.32. Therefore, the rate at which bromine gas effuses is 1/6.32 times the rate of helium gas, which is approximately 0.158.

At a Given Temperature, the Rate at Which Bromine Gas