How many moles of H_3PO_4H3PO4 are in 94.052 grams of H_3PO_4H3PO4?

1 Answer
anor277
Oct 5, 2017

We gots almost 1*mol1⋅mol "phosphoric acid"phosphoric acid......

Explanation:

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

"Number of moles"-="Mass"/"Molar mass of stuff"Number of moles≡MassMolar mass of stuff

And note that this is consistent dimensionally, because a molar mass is reported as g*mol^-1g⋅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.....

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