How does a catalyst work?
2 marks · EasyA certain reaction without a catalyst has an activation energy of 150 kJ/mol. When a catalyst is used, the alternative pathway requires only 80 kJ/mol. Calculate the reduction in activation energy provided by the catalyst.
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70 kJ/mol (±0.5)
Common mistakes: Adding instead of subtracting.
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Marking points
M1 · 1 mark · Subtracts the two activation energies: 150 - 80.
A1 · 1 mark · Correct final answer: 70 kJ/mol. (follow-through)
Worked solution