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Thermodynamics question

2000 · Q114
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Thermodynamics question

2000 · Q114

NEETChemistryThermodynamicsMCQ+4 / −1
For the reaction,
C2H5OH(l) + 3O2(g) →\to→ 2CO2(g) + 3H2O(l)
which one is true
  1. A
    Δ\DeltaΔH = Δ\DeltaΔE −-−RT
  2. B
    Δ\DeltaΔH = Δ\DeltaΔE + RT
  3. C
    Δ\DeltaΔH = Δ\DeltaΔE + 2RT
  4. D
    Δ\DeltaΔH = Δ\DeltaΔE −-− 2RT
View written solutionFree

Correct answer: A

As we know, Δ\Delta ΔH = Δ\Delta ΔE + Δ\Delta Δng RT

Now, Δ\Delta Δng = Number of gaseous moles of products – number of gaseous moles of reactions

= 2 – 3 = – 1

⇒\Rightarrow⇒ Δ\Delta ΔH = Δ\Delta ΔE + (–1) RT

Δ\Delta ΔH = Δ\Delta ΔE – RT

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