Calculate the number of moles in 10 g of hydrogen.

Explanation

To calculate the number of moles in 10 g of hydrogen (H₂), we can follow these steps:

### Step 1: Determine the molecular mass of hydrogen (H₂)
- Hydrogen exists as diatomic molecules (H₂), which means each molecule consists of 2 hydrogen atoms.
- The atomic mass of one hydrogen atom (H) is approximately 1 g/mol.
- Therefore, the molecular mass of H₂ is calculated as:
\[
\text{Molecular mass of H₂} = 2 \times \text{Atomic mass of H} = 2 \times 1 \, \text{g/mol} = 2 \, \text{g/mol}
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