Calculate the percentage composition of calcium nitrate.

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Solution

The formula of calcium nitrate is $C a (N O_{3})_{2}$
Thus, the formula mass or molecular mass
$= A t . m a s s o f C a + 2 \times A t . m a s s o f N + 6 \times A t . m a s s o f o x y g e n$
$= 40 + 2 \times + 6 \times 16 = 164$
% of Ca $= \frac{40}{164} \times = 24$
% of N $= \frac{28}{164} \times = 17$
% of O $= 100 - (24 + 17) = 59$

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