One mole of an ideal gas is isothermally expanded from 5.0 L to 10.0 L at 300 K. Compute the entropy changes for the system, surroundings, and the universe if the process is carried out (a) reversibly by adjusting the pressure of the surroundings to match the internal pressure of the gas, and (b) irreversibly, freely expanding in a vacuum.

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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