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The difference between

Question:

The difference between $\Delta \mathrm{H}$ and $\Delta \mathrm{U}(\Delta \mathrm{H}-\Delta \mathrm{U})$, when the combustion of one mole of heptane (1) is carried out at a temperature $T$, is equal to:

1. 3RT

2. $-3 \mathrm{RT}$

3. $-4 R T$

4. 4RT

Correct Option: , 3

Solution: