The main idea
1. A balanced molecular chemical equation indicates the number of each reactant required to make the products.
2. if you know how many of a particular reactant is required you can predict the amount of product produced.

Eg in the reaction
HCl + NaOH ---> h2O + NaCl

If I add 5 moles of HCl to 3 moles of NaOH for this reaction to go to completion only 3 of the 5 HCL moles available can be used.

Reactions & Rates
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