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AP EAMCET202318 May 2023Morning ShiftChemistryThermodynamics (C)Actual

The standard enthalpy of formation of CO ₂( ~g ) , CaO ( s ) and CaCO ₃( ~s ) are -393,-634,-1210 ~kJ ~mol ⁻¹ respectively. If all the substances are in standard state, the standard enthalpy of decomposition of calcium carbonate to CaO ( s ) and CO ₂ (g) (in kJ mol ⁻¹ ) is

Options

  1. A969
  2. B183
  3. C-969
  4. D-183

Correct answer

B. 183

Step-by-step solution

CaCO ₃( ~s ) CaO ( s )+ CO ₂( ~g ) H _ r ^ = [ _ f H ^ ( CaO )+ _ f H ^ ( CO ₂ ) ]- [ _ f H ^ ( CaCO ₃ ) ] aligned & =[(-634)+(-393)]-[-1210] & =+183 ~kJ ~mol ⁻¹ aligned

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