1) Determine the change in entropy for the expansion of 0.10 mole of an ideal gas from 2.0L to 3.0 L at constant temperature?
My work: 0.10 mole * (8.314 J/K)/ (1 mole) * ln (3.0L/2.0L) = 0.33 J/K
2) To what fraction of its original volume must a 0.50 mole sample of ideal gas be compressed at constant temperature for change in entropy to be -6.7 J/K?
My work: 0.50 mole * (8.314 J/K) / ( -6.7 J/K ) ??? I dont know how to solve this problem.