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MHT CET Chemistry question

ChemistryThermodynamicsMHT CET

The combustion enthalpies of carbon, hydrogen and methane are , and respectively at 25 °C. The value of standard formation enthalpy of methane at that temperature is

Answer: (C)

Solution

C + 2H2 -> CH4: = (C) + 2 (H2) - (CH4) = -395.5 - 571.6 + 890.4, which is about -76 kJ

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Question ID VK-064491