Problem: Consider the following generic reaction:A+2B→C+3D, with ΔH = 103 kJ .Determine the value of ΔH for each of the following related reactions.a. 3A + 6B → 3C + 9Db. C + 3D → A + 2Bc. 1/2C + 3/2D → 1/2A + B

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Use Hess Law to determine the value of ΔH for each reaction:

  • sum of Δfor individual steps Δof overall reaction

a. 3A + 6B → 3C + 9D 

  • coefficients are 3x bigger than given reaction
  • ΔH x 3 = 103 kJ x 3
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Problem Details

Consider the following generic reaction:

A+2B→C+3D, with ΔH = 103 kJ .

Determine the value of ΔH for each of the following related reactions.

a. 3A + 6B → 3C + 9D

b. C + 3D → A + 2B

c. 1/2C + 3/2D → 1/2A + B

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