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

2 answers:

8 0

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

xxMikexx [17]3 years ago

5 0

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!

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