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NTA Abhyas JEE Main2020ChemistryThermodynamics (C)Practice

What is the true regarding complete combustion of gaseous isobutane‐

Options

  1. AΔ H = Δ E
  2. BΔ H > Δ E
  3. CΔ H = Δ E = 0
  4. DΔ H < Δ E

Correct answer

D. Δ H < Δ E

Step-by-step solution

C 4 H 10 g + 6.5 O 2 g → 4 C O 2 g + 5 H 2 O ( l ) Δ n = 4 - 7.5 = - 3.5 Δ H = Δ E + Δ n g RT ∴ Δ H < Δ E

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