The reaction 2NO N2 + O2 has the following rate law: – ∆[NO]/∆t= 2k[NO]2. After a period of 2.0 x 103 s, the concentration of NO falls from an initial value of 2.8 x 10–3 mol/L to 2.0 x 10–3 mol/L. What is the rate constant, k?

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It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).