Question

One mole of an ideal gas is expanded isothermally and irreversibly from an initial volume of 10.0 L to a final volume of 20.0 L at a pressure equal to the final pressure and a temperature of 500 K. Calculate the value of w. Calculate the values of q. Calculate the value of ΔS (system). Calculate the values of delta S (surroundings). Calculate the values of ΔS (total).

Answer 1

For isothermal process,

The equation to calculate work done is given by

, here

Here   , , ,

and ,

workdone is considered as negative because the gas expands and the system looses internal energy, or the work is done by the system.

According to first law of thermodynamics,

Since internal energy of the system we get

So

Or

Its assumed that the value of pressure

For isothermal process,

The equation to calculate work done is given by

, here

Here   , , ,

and ,

workdone is considered as negative because the gas expands and the system looses internal energy, or the work is done by the system.

According to first law of thermodynamics,

Since internal energy of the system we get

So

Or

Its assumed that the value of pressure