The number of molecules in a portion of a substance is determined by the amount of this substance. From the condition, the amount of hydrogen substance is 14 mol. Then the number of molecules in a given portion is equal to:
N (H2) = n (H2) * Na, where n (H2) is the amount of hydrogen, Na is Avogadro’s constant, which is 6.02 * 10 ^ 23 mol / mol.
N (H2) = 14 mol * 6.02 * 10 ^ 23 mol / mol = 84.28 * 10 ^ 23 mol = 8.43 * 10 ^ 24 mol.
Answer: 14 moles of hydrogen contain 8.43 * 10 ^ 24 hydrogen molecules.
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