How many moles of #NH_3# are there in 77.5 g of #NH_3#?

1 Answer
Dec 11, 2015

Answer:

There are #"4.55 moles"# in #"77.5 g NH"_3"#.

Explanation:

Divide the given mass of #"NH"_3"# by its molar mass.

Molar mass of #"NH"_3":##"17.03052 g/mol"#http://pubchem.ncbi.nlm.nih.gov/compound/222#section=Top

#(77.5cancel"g NH"_3)xx(1"mol NH"_3)/(17.03052cancel"g NH"_3)="4.55 mol NH"_3""#