Calculate the molecular masses of `H_(2), O_(2), Cl_(2), CO_(2), CH_(4), C_(2)H_(6), C_(2)H_(4), NH_(3), CH_(3)OH`.

Explanation

To calculate the molecular masses of the given compounds, we will follow a systematic approach by adding the atomic masses of all the atoms present in each molecule. Below is the step-by-step calculation for each compound:

### Step 1: Calculate the molecular mass of `H₂`
- **Molecular mass of H₂ = 2 × Atomic mass of H**
- Atomic mass of H = 1 g
- Molecular mass of H₂ = 2 × 1 = **2 g**

### Step 2: Calculate the molecular mass of `O₂`
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