The amount of heat supplied at constant pressure is 18 kj/mol at 450C, the enthalpy change of system is :
Correct answer: C. 18 KJ/mol
- A. 9 KJ/mol
- B. 27 KJ/mol
- C. 18 KJ/mol
- D. 36 KJ/mol
Explanation
The enthalpy change (ΔH) of a system is equal to the heat supplied (q) at constant pressure. In this case, ΔH=18 kJ/mol as q=18kJ/mol.
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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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