Under conditions for which chlorine gas has an effusion rate of 2.4 × 10^-6 mol/sec,what would be the effusion rate for bromine gas,in mol/sec? A)1.1 × 10^-6mol/sec B)1.6 × 10^-6mol/sec C)2.3 × 10^-6mol/sec D)3.6 × 10^-6mol/sec E)5.4 × 10^-6mol/sec

Question

Quizplus · Accepted Answer

The effusion rate of a gas is inversely proportional to the square root of its molar mass. Bromine has a larger molar mass than chlorine, so it will have a slower effusion rate. Using the ratio of their molar masses, we find that the effusion rate of bromine will be:
(√35.5/√80) x 2.4 × 10^-6 mol/sec = 1.6 × 10^-6 mol/sec, which corresponds to choice (B).

Under Conditions for Which Chlorine Gas Has an Effusion Rate