Carbon dioxide and an unknown gas start to effuse from a container and the carbon dioxide takes 4.69 times as long to escape as the unknown gas.What is the identity of the unknown gas? A)(_Br₂) B)NO₂ C)HCl D)CO E)H₂

Question

Quizplus · Accepted Answer

The rate of effusion is inversely proportional to the square root of the molar mass (Graham's law). Since CO2 takes 4.69 times as long to effuse, the unknown gas must have a much lower molar mass. H2, with a molar mass of about 2 g/mol, fits this condition.

Carbon Dioxide and an Unknown Gas Start to Effuse from a Container