Question

atomic mass=56 and iron(fe)= 26
1.2 x 10²⁴ atoms of iron weigh ........... grams
plz answer it is urgent

Answer 1

No.of atoms of Fe = 1.2 x $10^{24}$
At. no. of Fe = 56u

No. of moles= Avagadro No./No. of atoms
                    =6.022 x $10^{23}$/1.2 x $10^{24}$
                    ≈5 moles
No. of moles= At.number / weight in grams
Weight=56/5=11.2grams
therefore the iron approximately weighs 11.2grams
                    

Answer 2

(1.2*10^24*56)/6.022*10^23