Editing Stoichiometry (section)

== Converting grams to moles ==
Stoichiometry is not only used to balance chemical equations but also used in conversions, i.e., converting from grams to moles using [[molar mass]] as the conversion factor, or from grams to milliliters using [[density]].  For example, to find the [[Amount of substance|amount]] of NaCl (sodium chloride) in 2.00&nbsp;g, one would do the following:
: <math>\frac{2.00 \mbox{ g NaCl}}{58.44 \mbox{ g NaCl mol}^{-1}} = 0.0342 \ \text{mol}</math>

In the above example, when written out in fraction form, the units of grams form a multiplicative identity, which is equivalent to one (g/g&nbsp;=&nbsp;1), with the resulting amount in moles (the unit that was needed), as shown in the following equation,
: <math>\left(\frac{2.00 \mbox{ g NaCl}}{1}\right)\left(\frac{1 \mbox{ mol NaCl}}{58.44 \mbox{ g NaCl}}\right) = 0.0342\ \text{mol}</math>