Hi all, I don't fully grasp definition of the rate as stated in the rate law. I do hope you guys could enlighten me! Here is what I don't understand: What does the rate in the rate law refer to? So lets say 3A + 2B -> 4C + D. Does the instantaneous rate derived from the rate law, given that I already have the rate equation and the instantaneous [A] and , refer to the rate of disappearance of A or B, or the rate of appearance of C or D. What I'm confused about is how the word rate as used in the rate law is simply referred to as the "instaneous rate of reaction". So if i get a figure from inputting all the data into the rate equation, what does this figure actually represent?