A crystalline hydrated salt on being rendered anhydrous loses 45.6% of its weight. The…
Chemistry · JEE Advanced · NTA Exams — Some Basic Concepts in Chemistry
A crystalline hydrated salt on being rendered anhydrous loses 45.6% of its weight.
The percentage composition of anhydrous salt is : Al = 10.5%, K = 15.1 %, S = 24.8% and oxygen = 49.6% Answer the following four questions based on these information. [Molar masses are : Al = 27, K = 39, S = 32]
What is the empirical formula of the hydrated salt ?
- \(\mathrm{K}_{2} \mathrm{AlS}_{2} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\)
- \(\mathrm{K}_{2} \mathrm{Al}_{2} \mathrm{~S}_{2} \mathrm{O}_{7} \cdot 16 \mathrm{H}_{2} \mathrm{O}\)
- \(\mathrm{K}_{3} \mathrm{AlS}_{2} \mathrm{O}_{12} \cdot 8 \mathrm{H}_{2} \mathrm{O}\)
- \(\mathrm{KAlS}_{2} \mathrm{O}_{8} \cdot 12 \mathrm{H}_{2} \mathrm{O}\)
Answer
(D) KAlS _ 2 O _ 8 12 H _ 2 O
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