The partial pressure of a gas is a inversely proportional to the temperature of the gas. b. directly proportional to the volume of the gas. c. always constant during a chemical reaction. d. directly proportional to the number of moles of the gas. e. proportional to the gas constant, R.

d. directly proportional to the number of moles of the gas.

Explanation:

The formula for the partial pressure of a gas is written as -

P = n * P (total)

P = partial pressure of the gas,

n = mole fraction of the gas,

P (total) = Total pressure of the mixture of gas.

Hence, from the above equation,

the partial pressure is directly proportional to the mole fraction, i. e., on increasing the number of moles of gas, the partial pressure increases.