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For the gas-phase reaction A(g) + 2 B(g) -> C(g) carried out with stoichiometric amounts of A and B, the half-life is 10 min when the initial pressure of A is 40 atm and 160 min when the initial pressure of A is 10 atm. What is the overall order of the reaction?
- 3
- 2
- 1
- 0
Correct answer: 3
Solution
From t(1/2) proportional to P^(1-n): 160/10 = (10/40)^(1-n) gives 16 = 4^(n-1), so n - 1 = 2 and n = 3.
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