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Mole Concept and Avogadro's Number

How much Ca...

Question

How much $C a$ is present in $C a {({N O}_{3})}_{2}$ that contains $20 g$ nitrogen?

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Solution

$C a {(N O_{3})}_{2}$
$1 m o l C a + 2 m o l N + 6 m o l O$
$\Rightarrow 2 m o l N \equiv 1 m o l C a$
$28 g N = 40 g C a$
$\Rightarrow 20 g N = x$
$\Rightarrow x = \frac{20 \times 40}{28} = 28.5714 g$
Hence, the answer is $28.5714 g .$

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