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Stoichiometric Calculations

What mass of ...

Question

What mass of $N a_{2} C O_{3}$ is required to remove hardness in above problem.

21.2 g m

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42.4 g m

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10.6 g m

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5.3 g m

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Solution

The correct option is B $21.2 g m$
$C a C l_{2} \Rightarrow 0.1 m o l e$
$N a_{2} C O_{3} r e q u i r e d \Rightarrow 0.1 m o l e$
$M g C l_{2} \Rightarrow 0.1 m o l e$
Total $N a_{2} C O_{3}$ required $= 0.2 m o l = 0.2 \times 106 = 21.2 g m$

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