Question

20 gram of an element contains 3×10^22 atoms. calculate gram atomic mass

Answer 1

Explanation:

Data:

mass of element = 20 gm

#of atoms = 3x10^22

gram atomic mass = ??

solution =

By using Formula

# of atoms = mole. x NA

3x 10^22/6.23x10^23 =mole

0.0498= Mole

mole = mass/ gm atomic mass = 20/gm atomic mass

20/0.0498 = gm atomic mass

401.606 = Gm Atomic mass