Such an equation is called a "proportion".
In a balanced equation, the coefficients show the mole ratio of the different substances. That is, it shows how each substance taking part in the reaction is related on a mole to mole basis.
A ratio shows the relationship between two quantities.Formula
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A proportion
Ration does not have units. You have to convert one of them to the same units and then work it out. For example: what is the ratio of 4m to 200cm ? This is the same as: 4m to 2m - so the answer is 2 to 1. (400cm to 200cm gives the same answer.)
It is determined by the chemical equation.
Proportion ^.^
A 'ratio' shows a relationship between two numbers. There's no such thing as the ratio of one single number.
An equation.
It is called a proportion.
equation
equation