Post-UTME Chemistry 2011 Objective — Question 4
Question 4 of 10 from the Post-UTME Screening (Post-UTME) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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A hydrated salt of formula MSO4·xH2O contains 45.3% by mass of water of crystallization. Calculate the value of x. [M=56, S=32, O=16, H=1]
- A. 3
- B. 5
- C. 7Correct
- D. 10
Explanation
Molar mass of hydrate=152+18x. Setting 18x/(152+18x)=0.453 and solving gives x≈7.
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