MHT CET 2023 Chemistry question

If 8.84 kj heat is liberated for formation of 3 g ethane calculate it's

(A)-8.00 kj
(B)15.0 kj
(C)30.0 kj
(D)-84.4 kjCorrect

Answer: (D)

Solution

Molar mass of ethane = g mol, so 3 g = 0.1 mol. Heat liberated on forming 0.1 mol is 8.84 kJ, so for 1 mol it is kJ. Heat is evolved, so kJ mol. Among the printed options only (d) kJ is negative and of

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Question ID VK-095204