Heat of combustion of A(s) is -10 kcal $m o l^{- 1}$ and that of B(s) is -15 kcal $m o l^{- 1}$ . 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

$\begin{array}{l} A + O_{2} \to Δ H_{1} = - 10 K c a l \\ B + O_{2} \to Δ H_{2} = - 15 K c a l \\ 3 A + x B = 105 \\ \Rightarrow 3 (10) + x (15) = 105 \Rightarrow x = 5 \end{array}$

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