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The percentage of water of crystallization in the compound \(\mathrm{C}_2 \mathrm{H}_2 ...
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The percentage of water of crystallization in the compound \(\mathrm{C}_2 \mathrm{H}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}\) is \([\mathrm{C}=12, \mathrm{H}=\) \(1, \mathrm{O}=16]\)
A.
\(28.57\)
B.
\(38.57\)
C.
4845
D.
\(58.57\)
Show Answer
Show Explanation
Correct Answer: A
Explanation
\begin{array}{l}
\mathrm{C}_2 \mathrm{H}_2 \mathrm{O}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}=(12 \times 2)+(1 \times 2)+(16 \times 4)+2(18)\\
=(24+2+64+36) g \mathrm{~mol}^{-1}\\
=126 \mathrm{gmol}^{-1}\\
\% \text { of } \mathrm{H}_2 \mathrm{O}=\frac{2(18)}{126} \times 100 \%\\
=\frac{36}{126} \times 100 \%=28.57 \%
\end{array}
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