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).
Last updated
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.
Practise Thermochemistry and Energetics of Chemical Reactions
728 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
All the enthalpy changes are________________?
At a particular temperature, H+(aq) + OH− (aq) → H2O(l); ∆H = −57.1 kJ The approximate heat evolved when 400 ml of 0.2 M H2SO4 is mixed with 600 ml of 0.1 M KOH solution will be:
Delta*H = Delta*E + P*Delta*V is formula of:
During a chemical reaction, heat of formation is
Enthalpy is measured at _: