AP Chemistry by Neil D. Jespersen

Author:Neil D. Jespersen
Language: eng
Format: epub
Publisher: Barron's Educational Series, Inc.
Published: 2013-06-05T16:00:00+00:00

FIGURE 12.1. Diagram illustrating that the heat of a reaction has the same magnitude whether the reaction is run in the forward or reverse direction. The sign of the heat of reaction, however, is positive in one direction and negative in the other.

The general principle that is an essential part of Hess’s law.

For the combustion of propane, Hess’s first rule (see above) tells us that multiplying the equation by 2 will result in ΔH° also being multiplied by 2:

2CH3CH2CH3(g) + 10O2(g) → 6CO2(g) + 8H2O(g) ΔH = −4088 kJ

If the reaction is multiplied by , the ΔH° will also be multiplied by :

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