1.

A piston filled with 0.4 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0^(@)C. As it does so, absorb 208 J of heat. The values of q and w for the process will be : (R = 8.314 J//mol K) (ln 7.5 = 2.01)

Answer»

`q = + 208 J, w = - 208 J`
`q = - 208 J, w = - 208 J`
`q = - 208 J, w = + 208 J`
`q = + 208 J, w = + 208 J`

SOLUTION :q = + 208 J
Since the process is ISOTHERMAL, `Delta U = 0`
:. From FIRST law of thermodynamics,
`Delta U = q + w`
`0 = q + w` or `w = - q`
`= - 208 J`


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