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Heat of combustion of A(s) is -10 kcal mol^-1 and that of B(s) is -15 Kcal 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

$Δ H_{c} o f A = - 10 k c a l / m o l e Δ H_{c} o f B = - 15 k c a l / m o l e$

Mixture of 3 moles of A & moles of B = 105 kcal
$\begin{array}{l} (3 \times 10) + (x \times 15) = 105 \\ 15 x = 75 \\ x = 5 \end{array}$

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