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Q.

A sample of ${NaHCO}_{3} (s)$ on heating undergoes 1.845 gm loss of mass. Approximate mass of ${NaHCO}_{3}$ (in nearest integer) in gm is :

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answer is 5.

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Detailed Solution

When we heat the sample of ${NaHCO}_{3}$ , we get,

$2 {NaHCO}_{3} \overset{Δ}{⟶} {Na}_{2} {CO}_{3} + H_{2} O + {CO}_{2}$

Here, the mass of ${NaHCO}_{3}$

$\frac{1.845}{62} \times 2 \times 84 = 5 g$

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