ΔH = ΔE+PΔV is the change in enthalpy at constant_.
Correct answer: B. Pressure
- A. Volume
- B. Pressure
- C. Temperature
- D. Mass
Explanation
At a constant pressure, the heat flow for any process is equal to the change in the internal energy of the system plus the work done (PV).
This question appeared on the NUMS 2018 paper, which you can sit online with every answer explained.
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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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