Question

How many molecules of hydrogen are in one mole of H2

Answer 1

One mole of \( H_2 \) (hydrogen gas) contains \( 6.022 \times 10^{23} \) molecules of \( H_2 \). This number, known as Avogadro's number, is the quantity of entities (in this case, molecules) in one mole of a substance. Since each \( H_2 \) molecule consists of two hydrogen atoms, one mole of \( H_2 \) contains two moles of hydrogen atoms. However, in answer to your question about the number of \( H_2 \) molecules, it is \( 6.022 \times 10^{23} \).