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JAMB Chemistry 2003 Question 5

Question 5

Chemical Formulae and Equations

3Cu + pHNO3 → 3Cu(NO3)2 + 4H2O + xNO
In the equation above, the values of p and x respectively are

  1. A.1 and 3
  2. B.2 and 3
  3. C.6 and 2
  4. D.8 and 2
Show the answer and explanation

Answer: D (8 and 2)

Explanation

Hydrogen: 4H2O has 8 H, so p = 8. Nitrogen: 8 = 6 (in 3Cu(NO3)2) + x, so x = 2.