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The mass of 4 moles of hydrogen gas can be calculated by multiplying the molar mass of hydrogen gas by the number of moles. The molar mass of hydrogen gas (H2) is 2.016 grams per mole. Therefore, the mass of 4 moles of hydrogen gas would be 8.064 grams.
It's important to note that the molar mass of a substance is the mass of one mole of that substance, and the mole is a unit of measurement that is used to quantify the amount of a substance. One mole of a substance is equal to Avogadro's number, which is 6.022 x 10^23 atoms or molecules. So, 4 moles of hydrogen gas would be equal to 4 x 6.022 x 10^23 hydrogen atoms or molecules.
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