Bes the author like to look at the rock sitting on his desk? 1 Why does the author like to

A. It reminds him of a trip to Canada.

B. It is made of gneiss, a rare mineral.

C. It makes him feel young in comparison.

D. It is flecked with feldspar, a valuable mineral.

i believe it is c.) 1575 j.

give me abc and i will get it for u.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally