Correct Mathematical Formulation Of First Law Of Thermodynamics Used In Thermochemistry Is.

The given options are:

(A) ΔH = ΔU − ΔnRT.

(B) ΔU = ΔH + ΔnRT.

(C) ΔH = ΔU + ΔnRT.

(D) ΔH = − ΔU + ΔnRT.

The correct answer is (C) ΔH = ΔU + ΔnRT.

The First Law of Thermodynamics is mathematically represented as ΔH = ΔU + ΔnRT.

Where:

ΔH is the heat exchanged between a system and its surroundings.

ΔU is the total change in the internal energy of a system.

ΔnRT is the work done by or on the system.

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