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Question: Answered & Verified by Expert
1 gram of hydrated oxalic acid [(COOH)2.2H2O] undergoes combustion it produces 2.2 kcal of heat. What will be its enthalpy of combustion (Hc)?
ChemistryThermodynamics (C)NEET
Options:
  • A -2.2kcal
  • B -126 kcal
  • C -277.2 kcal
  • D -423 kcal
Solution:
2782 Upvotes Verified Answer
The correct answer is: -277.2 kcal

Combustion enthalpy is the amount of energy released during complete combustion of one mole of the reactant in the presence of the oxygen.

It is always negative as per the thermodynamic sign convention.

The molar mass of the hydrated oxalic acid is =126 g mol-1

1g-2.2 kcal

126g-2.2×126 kcal=-277.2 kcal

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