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JEE Main 2015 Chemistry question

ChemistryThermodynamicsJEE Main 2015

The heat of atomization of methane and ethane are kJ mol and kJ mol, respectively. The longest wavelength of light capable of breaking the bond is (Avogadro's number , h J s)

Answer: (4)

Solution

Atomising breaks four CH bonds, so the CH bond energy is kJ mol. Atomising breaks six CH bonds and one CC bond: , giving kJ mol. Per molecule this is

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Question ID VK-115260