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We compare Experiments 1 and 4 to find the order with respect to C because [A] and [B] are the same concentration in both (10. mmol.L^-1 and 100. mmol.L^-1, respectively). We know that [C] is independent of the rate because even though the concentration of C in Experiment 4 is different from the one in Experiment 1, the initial rate is unchanged. The initial rate is 2.0 mmolG.L^-1.s^-1 in both.
Gurkriti Ahluwalia 1K wrote:therefore, is it safe to say that you DO NOT calculate the order of C because it is independent of the rate?? in other words, only the orders of A and B matter because they affect the rate
Well when you determine that the concentration of C is independent of the reaction rate, then you are essentially calculating the order of C since you know therefore that its order is zero. After you figure this out, then you can ignore C and just focus on the concentrations of A and B.
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