Answers

2015-01-04T14:31:01+05:30


Cu 63; (63 amu) (0.692) = 43.596 amu

and Cu 65 ; (65 amu) (0.308) = 20.02 amu

Average atomic mass of Cu= 43.596+20.02 = 63.616 amu

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2015-01-04T16:07:22+05:30
See 69.2+30.8=100 That is we have 100 parts The avg mass =(63×69.2+65×30.8)/100 =6361.6/100=63.616
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