Question

atomic mass of some elements are given [Mg=240=16]
a) how many atoms are these in 120g Mg?
b) find the mass of A×6.022×10²³ oxygen atoms​

Answer 1

a) no:of moles=120/24=5
No:of atoms=5*6.022*10^23
b) no: of moles = (A*6.022*10^23)/(6.022*10^23)=A
Mass = A*16