When 15 g of a mixture of NaCl and `Na_(2)CO_(3)` is heated with dilute HCl, 2.5 g of `CO_(3)` is evolved at NTP. Calculate percentage composition of the original mixture.

Explanation

To solve the problem of finding the percentage composition of a mixture of NaCl and Na₂CO₃, we can follow these steps:

### Step 1: Understand the Reaction
When Na₂CO₃ is heated with dilute HCl, it reacts to produce NaCl, CO₂, and H₂O. The balanced chemical equation is:
\[ \text{Na}_2\text{CO}_3 + 2 \text{HCl} \rightarrow 2 \text{NaCl} + \text{CO}_2 + \text{H}_2\text{O} \]

### Step 2: Determine the Molar Masses
- Molar mass of Na₂CO₃ = 2(23) + 12 + 3(16) = 106 g/mol
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