Question

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,

Answer 1

63.616

Step-by-step explanation:

you calcute to get the results

Answer 2

63.616

Step-by-step explanation:

DATA

1. first atomic mass;m1=63

1. second atomic mass;m2=65
2. first percentage;p1= 69.2%
3. second percentage me;p2=30.8%
4. 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