JAMB Chemistry 2009 Objective — Question 3

Question 3 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2009 Objective paper, with the correct answer and a full explanation.

The percentage of water of crystallization in ZnSO4.7H2O is

A. 33%
B. 44%Correct
C. 55%
D. 87%

Explanation

Molar mass of ZnSO4.7H2O = 287gmol-1. %water = (7x18/287) x 100% = 43.9%, approximately 44%. [Zn=65, S=32, O=16, H=1]

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