Post-UTME Chemistry 2011 Objective — Question 7
Question 7 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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Calculate the minimum volume of oxygen required for the complete combustion of a mixture of 20cm^3 of CO and 20cm^3 of H2
- A. 10cm^3
- B. 20cm^3Correct
- C. 40cm^3
- D. 80cm^3
Explanation
2CO+O2->2CO2 needs 10cm3 O2 for 20cm3 CO. 2H2+O2->2H2O needs 10cm3 O2 for 20cm3 H2. Total O2 = 10+10=20cm^3.
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