Question

How many molecules are in 118.4 grams of water?

Answer 1

Answer:

3.96×10^24

Explanation:

first find the number of moles first

n=mass/molecular mass

molecular mass of H2O according to my periodic table=18

n=118.4/18 n=6.5778

number of molecules=n×NA(Avogadro's constant)

number of molecules=6.5778×6.022×10^23 =3.96×10^24