A tank of helium has a volume of 50 liters and is under a pressure of 2,000 p. s.i.. This gas is allowed to flow into a blimp until the pressure
in the tank drops to 40 p. s.i. and the pressure in the blimp is 30 p. s.i..
What will be the volume of the blimp?

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