How many MOLECULES of silicon dioxide are present in 134 mol

How many MOLECULES of silicon dioxide are present in 1.34 moles of this compound? molecules. How many MOLES of silicon dioxide are present in 8.21 times 10^22 molecules of tins compound? moles.

Solution

1 MOLE OF SILICON DIOXIDE MEANS -------------------6.023*10^23 MOLECULES

       ?   --------------------------------------------------------------- 8.21*10^22 MOLECULES

                 = 8.21*10^22/(6.023*10^23)

                     =0.136 moles