Verified Solution • 2025–26 Session moderate

QJEEM19Ch3669: JEE Main 2019 Chemistry - Class 11 JEEM19Ch3669 Solution: The difference between H and U ( H – U), when the combustion of …

The difference between Δ\Delta H and Δ\Delta U ( Δ\Delta H – Δ\Delta U), when the combustion of one mole of heptane(l) is carried out at a temperature T, is equal to :

Multiple Choice Options

  • A – 4 RT
  • B 3 RT
  • C – 3 RT
  • D 4 RT

Step-by-Step Verified Solution

We know,

Δ\Delta H - Δ\Delta U = Δ\Delta ngRT

C7H16( ll ) + 11O2(g) →\to 7CO2(g) + 8H2O( ll )

Here Δ\Delta ng = 7 - 11 = - 4

∴\therefore Δ\Delta H - Δ\Delta U = - 4RT

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