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Graham's law of diffusion states that at constant temperature and pressure the rate of diffusion of a gas is

Adirectly proportional to its molar mass
Binversely proportional to its molar mass
Cinversely proportional to the square root of its molar mass
Ddirectly proportional to the square root of its density

Answer: C

Graham's law:

r \propto \frac{1}{M}

or equivalently

r \propto \frac{1}{d}

, since density is proportional to molar mass at fixed

T

and

P

.

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