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Manipal MET2019ChemistryThermodynamics (C)

For the reaction aligned CH ₃ COOH _ (l) & +2 O _ 2( ~g ) 2 CO _ 2( ~g ) & +2 H ₂ O _ (l) aligned at 25^ C and 1 atm pressure, H=-874 ~kJ . Then the change in internal energy ( E ) is

Options

  1. A-874 ~kJ
  2. B-871.53 ~kJ
  3. C-876.47 ~kJ
  4. D+874 ~kJ

Correct answer

A. -874 ~kJ

Step-by-step solution

For the reaction array r CH ₃ COOH (l)+2 O ₂( ~g ) 2 CO ₂( ~g ) +2 H ₂ O (l) H=-874 ~kJ array We know that H= E+P V From ideal gas equation P V= n R T Then H= E+ n R T Number of moles of reactant aligned & = Number of moles of products & n=0 & Then & H= E & E=-874 ~kJ aligned

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