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AP EAMCET20228 Jul 2022Morning ShiftChemistryThermodynamics (C)Actual

Calculate _r H ( kJ mol ⁻¹ ) of the following reaction array cc C ₂ H ₅ OH ( I )+7 / 2 O ₂( ~g ) 2 CO ₂( ~g )+3 H ₂ O ( I ) Molecule & _ f H ^0 ( ~kJ ~mol ⁻¹ ) C ₂ H ₅ OH ( I ) & -280 CO ₂( ~g ) & -400 H ₂ O ( l ) & -290 array

Options

  1. A-1950
  2. B-1100
  3. C-1390
  4. D-700

Correct answer

C. -1390

Step-by-step solution

_ r H ^ =2 _ f H _ CO ₂ ^ +3 _ f H _ H ₂ O ^ - _ f H _ C ₂ H ₅ OH ^ aligned & =2(-400)+3(-290)-(-280) kJ & =-800-870+280=-1390 ~kJ aligned

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