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"#......

We determine the number of moles given a mass using the QUOTIENT method.

#"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....

Thus, we now take the quotient.

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

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Answer 2

Caleb Adams

There are 1 mole of ( H_3PO_4 ) in 94.052 grams of ( H_3PO_4 ).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.