A 2.0 g sample containing `Na_2CO_3` and `NaHCO_3` loses 0.248 g when heated at 300° C, the temperature at which NaHC03 decomposes to `Na_2CO_3, CO_2` and `H_2O`. What is the percentage of `Na_2CO_3` in the mixture ?

Explanation

To solve the problem step by step, we will follow these calculations:

### Step 1: Write the balanced equation for the decomposition of NaHCO3
The decomposition of sodium bicarbonate (NaHCO3) can be represented by the following balanced equation:

\[ 2 \text{NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_2 \]

### Step 2: Determine the molar masses
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