In SI unit, heat of formation is expressed in:
Correct answer: B. KJ/mole
- A. Kcal/mole
- B. KJ/mole
- C. kg/mole
- D. None of the above.
Explanation
The correct answer is KJ/mole. In the International System of Units (SI), energy is typically measured in joules. For chemical reactions, including the heat of formation, energy values are often expressed in kilojoules per mole (KJ/mole) because the joule is a relatively small unit, and the kilojoule provides a more convenient scale. The other options are incorrect because kilocalories are not part of the SI system, kilograms measure mass, not energy, and 'None of the above' is incorrect since KJ/mole is indeed the correct SI unit.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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