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Question
Calculate the percentage composition of calcium chloride.
[Ca = 40, Cl = 35.5]
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Solution
Percentage composition of calcium chloride [CaCl2]
Molecular mass of CaCl2 = Ca + 2[Cl]
= 40 + 2[35.5]
= 40 + 71
= 111
% of Ca = `"Mass of calcium"/"Molecular mass" xx 100`
`=40/111 xx 100`
= 36.04%
% of chlorine = `"Mass of Cl"_2/"Molecular mass of CaCl"_2 xx 100`
`= 71/111 xx 100`
= 63.96%
Or % of Cl2 = 100 - 36.04 = 63.96%
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