The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. On combustion, both A and B produce carbon dioxide while C explodes forming steam, B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.
Fuel B is the most ideal fuel of the three for the following reasons:
(i) It has a high calorific value of 48 kJ/g.
(ii) It does not leave any residue and burns completely.
Explanation
Fuel A has a lower calorific value when compared with the other fuels, and therefore, cannot be considered the most ideal fuel.
Fuel C has both the characteristics of fuel B but is not safe, as it explodes.
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