Why are the dividing by 2 for the average rate? They should divide only when comparing, right? Where am I going wrong?

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Why are the dividing by 2 for the average rate? They should divide only when comparing, right? Where am I going wrong?

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## Look at the balanced equation

Look at the balanced equation and check the coefficients

1/2 Rate of disappearance of N2O5 = 1/4 rate of appearance of NO2