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

1 Answer
Oct 5, 2017

Answer:

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.....