the molar masses of four unknown gases are shown in the table.

molar mass of unknown gases
gas molar mass
a 44g/mol
b 20g/mol
c 30g/mol
d 32g/mol

which gas is likely to have the highest rate of effusion?
gas a
gas b
gas c
gas d

The correct answer is gas b.

Explanation:

The rate of effusion of a gas was determined by Graham's Law. This law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of the molar mass of that gas.

The equation given by this law follows:

From the above relation, if the molar mass of the gas is high, it means its rate of effusion will be less and vice-versa.

Thus, for a gas to have higher rate of effusion, it must has lower molar mass.

From the molar masses of the given gases, Gas B has lowest molar mass and thus, its rate of effusion will be the highest.

Hence, the correct answer is gas b.

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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.