WAEC Chemistry 2011 Theory — Question 29
Question 29 of 31 from the West African Examinations Council (WAEC) Chemistry 2011 Theory paper, with the correct answer and a full explanation.
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8c(i) Write an equation for the complete combustion of carbon in oxygen. (ii) Calculate the number of moles of carbon (IV) oxide produced from the complete combustion of 2.5g of carbon [C=12.0, O=16.0]. (iii) Mention one use of I. Carbon (II) oxide II. Carbon (IV) oxide.
Model answer
(i) C(s)+O2(g)→CO2(g). (ii) Mole of carbon = 2.5/12 = 0.2083 mol. From the equation, 1 mole of carbon gives 1 mole of CO2, so 0.2083 mol of carbon gives 0.2083 mol of CO2. (iii) Carbon (II) oxide (CO) is used for the extraction of metals; Carbon (IV) oxide (CO2) is used as a fire extinguisher.
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