A 100 mL solution was made by adding 1.43 g of $\mathrm{Na}_2 \mathrm{CO}_3 \cdot \mathrm{xH}_2 \mathrm{O}$. The normality of the solution is 0.1 N . The value of x is (The atomic mass of Na is $23 \mathrm{~g} / \mathrm{mol}$ )
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