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JAMB Chemistry 2010 Objective — Question 3

Question 3 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

3. Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V). A. 17.1% B. 27.6% C. 8.5% D. 13.1% [Ca=40, N=14, O=16]

A. 17.1%Correct
B. 27.6%
C. 8.5%
D. 13.1%

Explanation

Ca(NO3)2 has molar mass = 40 + 2(14+48) = 164. %N = (2x14/164) x 100 = 17.1%.

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