First slide

Hess law of constant summation

Question

Given $\frac{1}{2} A \to B + q_{1}; 2 B \to C - q_{2};$ where $q_{1} and q_{2}$ are the heat changes during the Process. The heat change for the process $C \to A$ will be

Moderate

Solution

$\frac{1}{2} A \to B + q_{1} \frac{1}{2} A \to B; ΔH = - q_{1} A \to 2 B; ΔH = - 2 q_{1} - - - (1) 2 B \to C - q_{2} 2 B \to C; ΔH = + q_{2} - - - (2) eq (1) + eq (2) A \to C; ΔH = q_{2} - 2 q_{1} then C \to A; ΔH = 2 q_{1} - q_{2}$

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