Verified Solution • 2025–26 Session moderate

QJEEM14Ch9282: JEE Main 2014 Chemistry - Class 11 JEEM14Ch9282 Solution: For complete combustion of ethanol, C 2 H 5 OH(l) + 3O 2 (g) →…

For complete combustion of ethanol, C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) the amount of heat produced as measured in bomb calorimeter, is 1364.47 kJ mol–1 at 25oC. Assuming ideality the Enthalpy of combustion, ΔCH, for the reaction will be : (R = 8.314 kJ mol–1)

Multiple Choice Options

  • A –1460.50 kJ mol–1
  • B – 1350.50 kJ mol–1
  • C – 1366.95 kJ mol–1
  • D – 1361.95 kJ mol–1

Step-by-Step Verified Solution

C2H5OH(ℓ)+3O2(g)

→2CO2(g)+3H2O(ℓ)

Bomb calorimeter gives ΔU of the reaction

Given, ΔU=−1364.47kJmol−1

Δng=−1

ΔH=ΔU+ΔngRT

=−1364.47−1×8.314×2981000

=−1366.93kJmol−1

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