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The difference between DeltaH and Delta...

The difference between `DeltaH and DeltaU (DeltaH - DeltaU)`, when the combustion of one mole of heptane (l ) is carried out at a temperature T, is equal to: `–xRT`. The value of x is_____.

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The correct Answer is:
4
Heptane
`C_(7) H_(16) (l) + 11 O_(2 (g)) rarr 7CO_(2(g)) + 8H_(2)O_((l))`
Since temperature T is given assume it at room temperature.
`DeltaH = DeltaU + Delta n_((g))RT`
`Delta H - DeltaU = - 4RT`
`Delta n_((g)) = 7-11 = -4`
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