Calculate the percentage composition of oxygen in calcium nitrate and gysum salt in Ca=40,N=14,O=16S=32,H=1
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The formula of calcium nitrate is Ca(NO
3
)
2
Thus, the formula mass or molecular mass
=At.massofCa+2×At.massofN+6×At.massofoxygen
=40+2×+6×16=164
% of Ca =
164
40
×=24
% of N =
164
28
×=17
% of O =100−(24+17)=59
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