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It’s essentially the coefficient in front of the reactant or product and it’s raised to the concentration of that reactant or product. For example, if given 2NO2 -> 2NO + O2, and asked to find the rate of consumption of NO2, it’ll be rate = k[NO2]^2.
The rate law or rate equation for a chemical reaction is an equation that links the reaction rate with the concentrations or pressures of the reactants and constant parameters. Basically it is a number that relates the rate of a chemical reaction with the concentrations of the reacting substances and the sum of all the exponents of the terms expressing concentrations of the molecules or atoms determining the rate of the reaction
If you change the concentration of reactant and the amount of product changes by the same amount, n is 1. If product changes by a higher value than your reactant, take the value the reactant was changed by and see to what power it must be raised by to get the same value as the product
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