O2(g) effuses at a rate that is times that of br2(g) under the same conditions.

Oxygen gas effuses at a rate that is 2.236 times that of bromine gas under the same conditions.

Explanation:

Graham's Law:

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

We are given:

Molar mass of oxygen gas= 32 g/mol

Molar mass of bromine gas = 160 g/mol

By taking their ratio, we get:

Oxygen gas effuses at a rate that is 2.236 times that of bromine gas under the same conditions.

answer; protein;

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