15.17 vs. 15.19 [ENDORSED]

[Michelle Dong 1F]

In the chart for #17, the initial rate is referred to as mmol G (which is a product) and in the chart for #19, the initial rate is referred to as mmol A (which is a reactant). Does it matter what the initial rate is of or should I just ignore the fact that one refers to product and the other to reactant? Also, for #17, is the initial rate for mmol G the rate specifically for 1 mmol of G or does it have anything to do with the unique rate of reaction?

[Chem_Mod]

Whether a rate is in terms of a particular reactant or product will only matter if we care about the unique rate for the reaction. The unique rate is defined as the rate in terms of a particular component of a reaction divided by its stoichiometric coefficient.

In 15.17 and 15.19, this conversion doesn't need to be done. The rate law can be determined from the rate of appearance of any product or disappearance of any reactant.