How much substance is 11.2 liters of hydrogen?

One mole of ideal gas under normal conditions takes a volume of 22.4 liters.

The amount of gas substance will be equal to the ratio of the volume of this gas under normal conditions to the volume of one mole of gas also under normal conditions.

The amount of substance contained in 67.2 liters of hydrogen will be equal to:

N H2 = 11.2 / 22.4 = 0.5 mol;

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