Question

The number of atom in 20 g of so3 is approximately ans is 6.022× 10 23 but how i cant find it

Answer 1

molar mass of SO3 = 32 +3 x 16 = 80 Then , no. of moles = 20/80 = 0.25 moles

again, no. of molecules = 0.25 x 6.022 x 10^ 23 =1.5055 x 10^ 23 molecules

so, the no. of atoms will be = 1.5055 x 10^ 23 x 4

=6.022 x 10^23 atoms