A system is a group of parts that can be
considered one unit. Storm systems, ecosystems,
and our bodies are natural systems. Cars and
houses are human-made systems.
Choose an example of a system, and analyze the
energy flow through the system. Describe in detail
how energy enters the system, how energy
changes form while in the system, and how
energy leaves the system.

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