What is the percentage composition of calcium in calcium nitrate?

[1 mark]

24%

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17%

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48%

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59%

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Solution

The correct option is A 24%
The formula of calcium nitrate is $C a {(N O_{3})}_{2}$ .

Thus, the formula mass or molecular mass
$= A t o m i c m a s s o f c a l c i u m + 2 [(A t o m i c m a s s o f n i t r o g e n) + (3 A t o m i c m a s s o f o x y g e n)]$
= 40 + 2 $\times$ [14 + (3 $\times$ 16)]
= 40 + 2 $\times$ (14 + 48)
= 164

The percentage of calcium would be:
$= \frac{M a s s o f c a l c i u m}{M a s s o f c a l c i u m n i t r a t e} \times 100 = \frac{40}{164} \times 100 = 24 %$

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