Problem: Consider the reactions:A → 2 B; ΔH1A → 3 C; ΔH2What is ΔH for the reaction 2 B → 3 C?

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We are asked what is ΔH for the reaction 2 B → 3 C. 


Modify the equation in such way that it adds up to be the target reaction. 

A → 2 B; ΔH1
A → 3 C; ΔH2

Reaction                                       Modification

2 B →A                                      -Eqn1   [reversed]
A → 3 C                                     + Eqn2   [no change]

__________________  

 2 B → 3 C


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Problem Details

Consider the reactions:
A → 2 B; ΔH1
A → 3 C; ΔH2
What is ΔH for the reaction 2 B → 3 C?

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