Question

How many molecules are in 25 grams of NH3??

Answer 1

Find no of moles forst

Answer 2

*first

Answer 3

\[moles =\frac{ mass }{ molar mass }\]

Answer 4

a "mole" is a measurement of the number of grams in which there are 6.02 x 10^23 atoms/molecules of a substance.

The molar mass of NH3 is 17.0306 g/mol.

SO, there are 1.468 moles of NH3 in 25 grams. (25/17.0306)

1.468 x (6.02 x 10^23)= 8.837 x 10^23 molecules.