Question

How many moles of `H_3PO_4` are in 94.052 grams of `H_3PO_4`?

Answer 1

We gots almost `1*mol` `"phosphoric acid"`......

Explanation:

Given a mass, we assess the number of moles by the QUOTIENT.....

`"Number of moles"-="Mass"/"Molar mass of stuff"`

And note that this is consistent dimensionally, because a molar mass is reported as `g*mol^-1`...and so we get the quotient....

`(g)/(g*mol^-1)=cancelg/(cancelg*mol^-1)=1/(1/(mol))=mol` as required....

And so here we take the quotient....

`(94.052*g)/(97.99*g*mol^-1)=??*mol`.....not quite a mole.....