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JEE Main202226 Jul 2022Morning ShiftChemistryThermodynamics (C)Actual

2 . 4   g coal is burnt in a bomb calorimeter in excess of oxygen at 298   K and 1   atm pressure. The temperature of the calorimeter rises from 298   K to 300   K . The enthalpy change during the combustion of coal is - x   kJ   mol - 1 . The value of x is_____(Given : Heat capacity of bomb calorimeter 20 . 0   kJK - 1 . Assume coal to be pure carbon)

Correct answer

0

Step-by-step solution

C s + O 2 g → CO 2 g ; ΔH = - xkJ / mole Q = CΔT = 20   kJ × 2 40   kJ heat is released for 2 . 4   g of Carbon For 1 mole ' Carbon ' Q = 40 2 . 4 × 12 = 400 24 × 12 = 200   kJ / mole Q = ΔE = ΔH = 200   kJ   ∵ Δn g = 0 x = 200

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