Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this question. A solution is made of 300 grams of ethanol
(C2H5OH)
and 500 grams of water.
What is the mole fraction of ethanol in this solution?
O 0.19 M
O 0.81
O 0.81 M
O 0.19

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