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10g mixture of $N a H C O_{3}$ and $N a_{2} C O_{3}$ has 1.68 g $N a H C O_{3}$ . It is heated at 400K. Weight of
residue will be?

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8.32 g

10 g

1.68 g

9.38 g

answer is A.

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Detailed Solution

$2 N a H C O_{3} \overset{Δ}{\to} N a C O_{3} + C O_{2} + H_{2} O$

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$\begin{array}{l} 2 \times 88 62 \\ 1.68 ? \\ 168 g N a H C O_{3} \to 62 \\ 1.68 g N a H C O_{3} \to ? \\ \frac{1.68 \times 62}{168} = 0.62 \end{array}$

weight of residue = 10 – 0.62 = 9.38 g

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