How many molecules are present in 1 kg of hydrogen ?

Explanation

To find out how many molecules are present in 1 kg of hydrogen (H₂), we can follow these steps:

### Step 1: Determine the molecular weight of hydrogen
Hydrogen exists as diatomic molecules (H₂), and its molecular weight is calculated as follows:
- Each hydrogen atom has an atomic mass of approximately 1 g/mol.
- Therefore, the molecular weight of H₂ = 2 × 1 g/mol = 2 g/mol.

### Step 2: Use Avogadro's number
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