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Introduction to rate law

AP.Chem: TRA‑3 (EU), TRA‑3.B (LO), TRA‑3.B.2 (EK), TRA‑3.B.3 (EK), TRA‑3.B.4 (EK), TRA‑3.B.5 (EK)

Problem

The rate law for a particular reaction is start text, r, a, t, e, end text, equals, k, open bracket, X, close bracket, squared. In an experiment, the initial rate of the reaction is determined to be 0, point, 080, start text, m, o, l, end text, slash, left parenthesis, start text, L, end text, dot, start text, s, end text, right parenthesis when the initial concentration of X is 0, point, 20, start text, m, o, l, end text, slash, start text, L, end text.
What is the value of the rate constant, k, for the reaction?
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