5. The element copper has naturally occurring isotopes with mass numbers of 63

and 65. The relative abundance and atomie masses are 69.2% and 30.8%

respectively. Calculate the average atomic mass of copper,

63.616

Explanation:

DATA

1. first atomic mass; m1=63

second atomic mass; m2=65 first percentage; p1 = 69.2% second percentage me; p2=30.8% average mass; avg=?

SOLUTION

avg = (m1) (p1) + (m2) (p2)

100

avg = (63) (69.2) + (65) (30.8)

100

avg = 4359.6 + 2002

100

avg = 6361.6

100

avg = 63.616

63.616

Explanation:

you calcute to get the results