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For the reaction $A + B \to$ products, the rate law $r = k[A][B]^2$ has overall order:
A$1$, since A is first order in the formula here
B$3$, since the sum of exponents is $1 + 2 = 3$ for both
C$2$, since B has exponent $2$ in the rate law alone
D$0$, since rate is not proportional to anything here
Answer & Solution
Correct answer: B. $3$, since the sum of exponents is $1 + 2 = 3$ for both
Overall order = sum of exponents = 1 + 2 = 3.
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