Question

Calculate the number of moles of Cl atoms in 1.81×10^24 formula units of magnesium chloride,MgCl2.

Answer 1

How do i work this out?

Answer 2

you need to use: \(n=\dfrac{N}{N_A}\)

where n= moles, N=particles \(N_A\)=avogadros number

but you need to take into account the number of atoms present in one particle (formula unit). (There are 2)