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JEE Main 2003 Chemistry question

ChemistryThermodynamicsJEE Main 2003

If at 298 K the bond energies of , , and bonds are respectively 414, 347, 615 and 435 kJ , the value of enthalpy change for the reaction at 298 K will be

Answer: (3)

Solution

. Broken: one C=C (615) and one H–H (435) = 1050 kJ. Formed: one C–C (347) and two new C–H (2

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Question ID VK-038153