WBJEE · Chemistry · Some Basic Concepts of Chemistry
In the crystalline solid \(M \mathrm{SO}_{4} \cdot n \mathrm{H}_{2} \mathrm{O}\) of molar mass 250 g \(mol^{-1}\) , the percentage of anhydrous salt is 64 by weight. The value of \(n\) is
- A 2
- B 3
- C 5
- D 7
Answer & Solution
Correct Answer
(C) 5
Step-by-step Solution
Detailed explanation
\[ \begin{aligned} &\text {Mass of } \mathrm{H}_{2} \mathrm{O}=\frac{36}{100} \times 250=90 \mathrm{g}\\ &\text { Moles of } \mathrm{H}_{2} \mathrm{O}=\frac{90}{18}=5 \mathrm{mol} \end{aligned} \] In the crystalline solid \(M \mathrm{SO}_{4} \cdot n \mathrm{H}_{2} \mathrm{O},\)…
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