Question

How many atoms are in a sample of 72.8 g calcium (Ca)?

Answer 1

Atomic mass Ca=40.078 a.m.u

40.078 g--------------------6.02x10²³  atoms
72.8 g ---------------------- ??

72.8 x (6.02x10²³ ) / 40.078 =

4.38x10²⁵ / 40.078 = 1.093x10²⁴ atoms


HOPE THIS HELPED :D

Answer 2

Atomic mass Ca = 40.078 a.m.u

40.078 g -------------------- 6.02x10²³ atoms
72.8 g ---------------------- ??

72.8 x ( 6.02x10²³) / 40.078 =

4.38x10²⁵ / 40.078 = 1.093x10²⁴ atoms

hope this helps!