26.8 g of `Na_2SO_4.xH_2O` gave 12.6 g of water on heating. Determine the value of x in the compound using mole concept.

Explanation

To determine the value of \( x \) in the compound \( Na_2SO_4 \cdot xH_2O \), we will follow these steps:

### Step 1: Identify the mass of water lost
The mass of \( Na_2SO_4 \cdot xH_2O \) is given as 26.8 g, and the mass of water lost upon heating is 12.6 g.

### Step 2: Calculate the mass of anhydrous \( Na_2SO_4 \)
To find the mass of anhydrous \( Na_2SO_4 \), we subtract the mass of water lost from the total mass:
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