alleryStart learning →On a reaction diagram the reagents sit at 6 kJ and the transition state at 20 kJ. What is the activation energy?
A14 kJ
B26 kJ
C20 kJ
D6 kJ
Answer & Solution
Correct answer: A. 14 kJ
1. The activation energy is the climb from the starting reagents up to the peak.
2. The peak of the curve is the transition state, here at 20 kJ.
3. Subtract the reagent energy: 20 kJ minus 6 kJ.
4. So the activation energy is 14 kJ.
5. Answering 20 kJ reads the height above the zero line rather than above the reagents.
6. Answering 26 kJ adds the two values instead of subtracting.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.7 Catalysis_
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