Question

Calculate the moles of Fe in 9.62 x10^22 atoms of Fe

Calculate the moles of C2H6O in 5.68x10^24 molecules of C2H6O

Answer 1

we know that

moles = number of atoms / avagadro number

also

avagadro number = 6.023 x 10^23

given

number of atoms = 9.62 x 10^22

so

moles of Fe = 9.62 x 10^22 / 6.023 x 10^23

moles of Fe = 0.1597

so

there are 0.1597 moles of Fe

2)

now

we know that

moles = number of molecules / avagadro number

also

avagadro number = 6.023 x 10^23

given

number of molecules = 5.68 x 10^24

so

moles of C2H60 = 5.68 x 10^24 / 6.023 x 10^23

moles of C2H60 = 9.43

so

there are 9.43 moles of C2H60