Question

Enthalpy of the system is given as:
(A)U + PV
(B)H = PV
(C) U ˗ PV
(D) H - V

Answer 1

Hint: Enthalpy is a chemical property of a system and it is a state function favoured to several extents in chemical, biological, and physical systems at constant pressure. Enthalpy can be defined as the sum of the internal energy and the product of its pressure and volume.

Complete step by step answer:
>We can express the Enthalpy in the form of a chemical formula.
>The formula of Enthalpy is as follows.
H = U + PV
where H = Enthalpy
U = Internal Energy
P = Pressure
V = Volume
>Change in enthalpy of a reaction (ΔH) can be negative or positive.
>If the reaction is exothermic means heat is going to be released into the environment then the enthalpy of the reaction will be a negative value.
>If the reaction is endothermic means heat is going to be absorbed from the environment then the enthalpy of the reaction will be positive.
>If the enthalpy of a reaction is negative then we can call the reaction a spontaneous reaction.

So, the correct option is A.

Note:>Don’t be confused with the words enthalpy and entropy. Both are not the same.
>Entropy can be defined as the degree of randomness or disorder in a chemical process.
>If the enthalpy is negative then the entropy (more disorder) will be positive in a spontaneous chemical reaction.