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Rise in temperature, ΔT = 299-298 = 1 k
Heat capacity of calorimeter , Cv = 20.7 kJ/mol (given)
so, Heat absorbed by calorimeter = Cv × ΔT = 20.1 × 1= 20.1kJ
This is the heat evolved in combustion of 1g graphite
So, heat evolved in the combustion of 1 mole of graphite
i.e. 12 g of graphite = 20.7 × 12 = 284.4kJ
Since heat is evolved and vessel is closed
so, enthalpy change of the reaction = - 284.4kJ/ mol
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