passwella.
Menu

JAMB Chemistry 2010 Question 3

Question 3

Mole Concept and Stoichiometry

Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V). [Ca = 40, N = 14, O = 16]

  1. A.8.5 %
  2. B.13.1 %
  3. C.17.1 %
  4. D.27.6%
Show the answer and explanation

Answer: C (17.1 %)

Explanation

Ca(NO3)2 = 40 + 2(14 + 48) = 164. Nitrogen = 28, so 28/164 × 100 = 17.1%.