The molar mass of argon is 40 g/mol. what is the molar mass of a gas if it effuses at 0.91 times the speed of argon gas?

Answer : The molar mass of a gas is, 48.3 g/mole

Solution : Given,

Molar mass of argon gas = 40 g/mole

According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

or,

where,

= rate of effusion of a gas

= rate of effusion of argon gas

= molar mass of a gas

= molar mass of argon gas

As per question,

Now put all the given values in the above formula, we get the molar mass of a gas.

Therefore, the molar mass of a gas is, 48.3 g/mole

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