Question

Heat released in a reaction at constant pressure is called

a. heat of formation heat of formation

b. entropy change

c. enthalpy of reaction

d. internal energy of reaction

Answer 1

hii dear,
the ans is,
c .enthalpy of reaction

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Answer 2

Answer:

Option (c) enthalpy of reaction is correct.

Explanation:

Enthalpy

• A process that occurs at a constant temperature and constant pressure with varying volume. The total energy of a system is called heat content or enthalpy of the system (H).

Enthalpy of reaction

• It is the amount of heat either evolved or absorbed, at constant pressure, in a chemical reaction when the number of moles of the reactants has completed completely reacted.

• For example-

1. C (s) + O₂ (g) → CO₂ (g)   ΔH = -393.5 kJ (heat released)
2. N₂ (g) + O₂ (g) → 2NO (g)   ΔH = +90.25 kJ (heat absorbed)

Conclusion:

Heat released in a reaction at constant pressure is called enthalpy of reaction.