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<math>
<math>
\text{moles} = \frac{\text{mass}}{M_r}
\text{moles} = \frac{\text{mass}}{M_r}
<ref>hello<ref>

Revision as of 13:44, 11 April 2012

<math> \text{moles} = \frac{\text{mass}}{M_r} <ref>hello<ref>