Heat of combustion of A(s) $-$ 10kcal ${mol}^{- 1}$ and that of B(s) is $-$ 15Kcal ${mol}^{- 1} .$ Mixture containing 3 moles A(s) and x moles B(s) on combustion released 105 kcal of heat. What is the value of x?

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answer is 5.

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Detailed Solution

$3 (A) + x (B) = - 105 3 (- 10) + x (- 15) = - 105 - 30 + x (- 15) = - 105 ∴ x = 5$

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