Substance $A_{2} B (g)$ can undergoes decomposition to form two set of products
If the molar ratio of $A_{2} (g) t o A (g)$ is 5 : 3 in a set of product gases. Determine then the energy involved in the decomposition of 1 mole of $A_{2} B$

43.73

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23.6

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45.8

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Solution

The correct option is A 43.73
Molar Ratio of $A_{2} : A = 5 : 3$
Energy involved in formation of 5 moles of $A_{2} = 40 \times 5 = 200 k J$
Energy involved in formation of 3 moles of $A = 50 \times 3 = 150 k J$
Total energy involved in decomposition of $A_{2} B = 200 + 150 = 350 K J$
Energy per mole $\frac{350}{5 + 3} = 43.75 K J / m o l e$

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