How many gallons of octane C8H18 having a density of 0 703 g cm would have to be burned to produce the same amount of energ as

Question

How many gallons of octane C8H18 having a density of 0 703 g cm would have to be burned to produce the same amount of energ as in the following production of 3 15 g of He by the fusion reaction H H He

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