Soluble salts can be prepared using the following methods except by
A.
B.
C.
action of dilute acids on
metals.
action of dilute acid on an
insoluble base.
direct combination of
constituent elements.
neutralization reactions.
precipitation from solutions
achun
D.
E.

it should be all of them because it asks if you included all of those in your answer

explanation:

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