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Question

Calculate the percentage composition of calcium nitrate.

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Solution

The formula of calcium nitrate is Ca(NO3)2
Thus, the formula mass or molecular mass
=At.massofCa+2×At.massofN+6×At.massofoxygen
=40+2×+6×16=164
% of Ca =40164×=24
% of N =28164×=17
% of O =100(24+17)=59

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