Final answer:
The molar volume of hydrogen gas at STP is 22.4 L/mol.
Step-by-step explanation:
The student is asked to calculate the molar volume of hydrogen gas at standard temperature and pressure (STP).
At STP, which corresponds to a temperature of 0°C (273 K) and a pressure of 1 atm, the molar volume of an ideal gas is known to be 22.4 L/mol.
We can directly apply this information for hydrogen gas, which is a diatomic molecule with molecular formula H2. Therefore, the molar volume of hydrogen gas at STP is 22.4 liters per mole (L/mol).