20. One mole of an ideal gas at 25°C is expanded isothermally and reversibly from 125.0 L to 250.0 L. Which statement is correct? (A)\(\Delta S_{gas} = 0\) (B)\(\Delta S_{gas} = R\ln 2\) (C)\(\Delta S_{univ} = 0\) (D)\(\Delta S_{surr} = 0\) (E)\(\Delta S_{gas} = \Delta S_{surr}\)

4. To calculate the concentration in molarity of a salt solution, you need to know (A)The mass of the salt added and the volume of water added to the solution. (B)The mass of the salt added to the solution and the total volume of the solution. (C)The mass of the salt added, the molar mass of the salt, the volume of water added to the solution. (D)The molar mass of the salt and the total volume of the solution. (E)The mass of the salt added, the molar mass of the salt, the volume of water added, and the total volume of the solution.

20. One mole of an ideal gas at 25°C is expanded isothermally and reversibly from 125.0 L to 250.0 L. Which statement is correct?
(A)\(\Delta S_{gas} = 0\)
(B)\(\Delta S_{gas} = R\ln 2\)
(C)\(\Delta S_{univ} = 0\)
(D)\(\Delta S_{surr} = 0\)
(E)\(\Delta S_{gas} = \Delta S_{surr}\)

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