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NEET2010ChemistryThermodynamics (C)Actual

The following two reactions are known aligned & Fe ₂ O ₃( ~s )+3 CO ( g ) 2 Fe ( s )+3 CO ₂( ~g ), & H =-26.8 ~kJ & FeO ( s )+ CO ( g ) Fe ( s )+ CO ₂( ~g ) & H =-16.5 ~kJ aligned The value of H for the following reaction Fe ₂ O ₃( ~s )+ CO ( g ) 2 FeO ( s )+ CO ₂( ~g ) is

Options

  1. A+10.3 ~kJ
  2. B-43.3 ~kJ
  3. C-10.3 ~kJ
  4. D+6.2 ~kJ

Correct answer

D. +6.2 ~kJ

Step-by-step solution

Given, (I) Fe ₂ O ₃( ~s )+3 CO ( g ) 2 Fe ( s )+3 CO ₂( ~g ) ; H =-26.8 ~kJ (II) FeO (s) + CO ( g ) Fe ( s )+ CO ₂( ~g ) ; H =-16.5 ~kJ On multiplying Eq (II) with 2, we get (III) 2 FeO ( s )+2 CO ( g ) 2 Fe ( s )+2 CO ₂( ~g ) ; H =-33 ~kJ On subtracting Eq (III) from I, we get array r Fe ₂ O ₃( ~s )+ CO ( g ) 2 FeO ( s )+ CO ₂( ~g ) ; H =-26.8-(-33) =+6.2 ~kJ array

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