Question

In: Chemistry

the following stepwise reactions and associated ∆H° values Write the overall reaction. Determine the ∆H° for...

  1. the following stepwise reactions and associated ∆H° values
  2. Write the overall reaction.
  3. Determine the ∆H° for the reaction you wrote.
  4. The reaction is _________.
  5. Calculate ∆H° for the reaction:
  6. 3XY + 3YZ →   3XZ +   6Y

Step 1:   X2 + 2Y   →    2XY

  • H° = -125.20 kJ

Step 2:    XY +   Z2 →     XZ + YZ

  • H° = 18.50 kJ

Step 3:    2XZ   →    X2 +   Z2

  • H° = 80.52 kJ

Solutions

Expert Solution

(Enthalpy change for each reaction is ∆H° not H°.)

The law used here to solve is Hess's law of constant heat summation. The overall reaction : 3XY + 3YZ → 3XZ + 6Y

When we reverse a reaction, the sign of ∆H° get changed.

∆H°rxn = 78.54 kJ

Endothermic reaction ( positive value of ∆H°rxn)


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