`20 g` of hydrogen and `128g` of oxygen are contained in a `20 L` flask at `200^(@)C`. Calculate the total pressure of the mixture. If a spark ignites the mixture, what will be the final pressure?

Explanation

To solve the problem, we will follow these steps:

### Step 1: Calculate the number of moles of hydrogen (H₂) and oxygen (O₂).

**Hydrogen:**
- Given mass of hydrogen = 20 g
- Molar mass of hydrogen (H₂) = 2 g/mol
- Number of moles of hydrogen (n₁) = mass / molar mass = 20 g / 2 g/mol = 10 moles
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