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Direct Variation

How many gram...

Question

How many grams of ${N a}_{2} C O_{3}$ are to be weighed to get $0.1$ mole ${N a}_{2} C O_{3}$ ?

10 g

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5 g

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10.6 g

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12.6 g

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Solution

The correct option is C $10.6 g$
given that $0.1$ mole $N a_{2} C O_{3}$
Molar mass $= 2 \times 23 + 12 + 3 \times 16$
$= 106$
Moles $= \frac{g r a m o f w e i g h t}{m o l a r m a s s}$
$0.1 = \frac{g r a m w e i g h t}{106}$
gram weight $= 10.6 g$

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