ICSE Class 10 Chemistry 2017 Solved Paper

Question : 32 of 86

Marks: +1, -0

Calculate the percentage of water of crystallization in

{\CuSO}_4 .5 {\H}_2 {\O}

(H=1, O=16, S=32, C u=64)

Solution:

Molar mass of

{\CuSO}_4 ⋅ 5 {\H}_2 {\O}

\;=[54+32+16 × 4+5 × 18]

\;=250

Mass of water of crystallisation

=90

\% \;\text " of water "\;\;=\;{90}/{250} × 100

\;=36 \%

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