What is the number of formula units in a 3.29 mol sample of CaO ?

Question

number of formula units:

as well as

2.) A reaction produces 0.8090.809 moles of H2OH2O. How many molecules of H2OH2O are produced?

number of molecules:

Answer 1

asking for number of formula units is the same thing as asking for the number of atoms so moles and formula units are related through avagadros number

3.29 mol X (6.022E23 f.u/1mol)= 1.98E24 formula units

.8090 mol (6.022E23molecules/mol)=4.87E23 molecules