The molar mass of an unknown gas was measured by an effusion experiment. It was found that it took 63 s for the gas to effuse, whereas nitrogen gas (N2) required 48 s. The molar mass of the unknown gas is-

8.13 g/mol.

Explanation:

The following formula gives us the relationship between the effusion rates of two gases and their molar masses:

where x and y are respective sample gases and MM and rate are molar mass and rate of effusion respectively.

⇒

y= 14 /  = 8.13 g/mol.

h let me think

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.