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For the reaction aG + bH → products, the rate becomes eight times larger when the concentrations of both G and H are doubled. If only the concentration of G is doubled while H is kept unchanged, the rate becomes twice as large. What is the overall order of the reaction?
- 0
- 1
- 2
- 3
Correct answer: 3
Solution
Doubling both -> 8x means 2^(a+b)=8, so a+b=3. Doubling G only -> 2x means a=1, hence b=2. Overall order = a+b = 3.
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