The enthalpy change for chemical reaction is denoted as `DeltaH^(Theta)` and `DeltaH^(Theta) = H_(P)^(Theta) - H_(R)^(Theta)`. The relation between enthalpy and internal energy is expressed by equation:
`DeltaH = DeltaU +DeltanRT`
where `DeltaU =` change in internal energy `Deltan =` change in number of moles, `R =` gas constant.
Enthalpy of the system is given as

Options

A. `H = PV`
B. `U +PV`
C. `U - PV`
D. `H = - PV`

Explanation

To solve the problem, we need to find the expression for the enthalpy of the system based on the given relationships. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the given equations
We have two important equations:
1. The change in enthalpy for a reaction:
\[ \Delta H^{\Theta} = H_{P}^{\Theta} - H_{R}^{\Theta} \]
...