Heat absorbed by a substance at a constant pressure is equal to _.
Correct answer: B. ΔH
- A. ΔG
- B. ΔH
- C. ΔE
- D. ΔH-ΔE
Explanation
Enthalpy change is the heat absorbed by a substance at constant pressure. ΔH= ΔU + PΔV= Q - PΔV + PΔV = Q
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About Enthalpy
Enthalpy is the heat content of a system measured at constant pressure, and its change indicates whether a reaction or physical process is endothermic or exothermic. The topic covers state functions, enthalpy diagrams, standard enthalpy of formation, combustion and neutralisation, and the relationship between ΔH and internal energy change.
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