Lets say you have the reaction(adsbygoogle = window.adsbygoogle || []).push({});

aA + bB => cC + dD

The rate of the reaction is given by the change in initial concentration over the change in time.

[itex]-\frac{\Delta \left[ A \right]}{a\Delta T}\; =\; -\frac{\Delta \left[ B \right]}{b\Delta T}\; =\; \frac{\Delta \left[ \mbox{C} \right]}{c\Delta T}\; =\; \frac{\Delta \left[ D \right]}{d\Delta T}[/itex]

However, there is also the rate expression, which is of the form

[itex]\mbox{Re}action\; Rate\; =\; k\; \left[ A \right]^{m}\left[ B \right]^{n}[/itex]

What is the difference between these two, and what purpose does each one serve?

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# Difference between Reaction Rate and Rate Law?

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