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Toss Up - Chemistry - Multiple Choice

Which of the following are the units of the rate constant for a 2nd order reaction given that concentration is measured in molarity and time in seconds:
W) M-2s-1
X) M-1s-1
Y) Ms-1 z) M-2minutes-1

ANSWER: X) M-1s-1 (Solution: units relationship is M1-order x time-1)