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Which of the following law is not used in combustion calculation?

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Which of the following law is not used in combustion calculation?

(a) The law of conservation of mass

(b) The law of definite proportion

(c) The law of multiple proportion

(d) The law of conservation of energy

The question was posed to me in an interview.

This question is from Combustion Calculation topic in section Fuels and Combustion of Engineering Chemistry II

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Correct choice is (c) The law of multiple proportion

To elaborate: According to the law of multiple proportion, “If two elements combine together to form more than one compound, than the ratios of masses of the second element which combines with a fixed mass of first element will be ratios of small whole number”. Since combustion does not involve multiple elements, this law is not required.

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