Given:
(i)
(ii)
(iii)

Which algebraic relationship is correct?

Question

Given:
(i) 
(ii) 
(iii)

Which algebraic relationship is correct?

Canvas Classes · Accepted Answer

Strategy:
 Apply Hess's Law. If a chemical equation is the sum of two or more other equations, its enthalpy change is also the sum of their enthalpy changes.

Step 1: Observe the relationship between reactions
(i)  (Enthalpy )
(ii)  (Enthalpy )
(iii)  (Enthalpy )

Notice that adding (ii) and (iii) yields:

Simplifying:

Step 2: Match with enthalpy values
Since reaction (i) is the sum of (ii) and (iii), then:
.

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