passwella.
Menu

JAMB Chemistry 1980 Question 4

Question 4

Gas Laws

10cm3 of CO is mixed and sparked with 100 cm3 of air containing 21% O2. If all the volumes are measured at S.T.P, the volume of resulting gases would be

  1. A.90cm3
  2. B.100 cm3
  3. C.105 cm3
  4. D.110 cm3
  5. E.115 cm3.
Show the answer and explanation

Answer: C (105 cm3)

Explanation

2CO + O2 → 2CO2. 10 cm3 CO uses 5 cm3 O2 and forms 10 cm3 CO2, so the total volume falls by 5: 110 − 5 = 105 cm3.