Question

how would I answer #1 and then how would you do #2

AH Ch. 19 Lecture Example Problems (for any phase Change) kample Problems AS = 6OIOS J. Muench VITAL Group Activity #9 CHEM 162 Madison Miller name 1. In a certain process, the change in entropy of the system is -25J/K. a. If it is reversible, then what is the change in entropy for the surroundings? b. If it is irreversible and spontaneous, then what would you predict for the change in entropy for the surroundings? 2. What is the change in entropy in the system when 4.50g of ethanol (CH3CH2OH) condenses to liquid at its normal boiling point of 78°C? The heat of vaporization for ethanol is 38.56kJ/mol.

Answer 1

@ Asi totod. As system it us sirending for reversible change->_As total = 0 As system + As surroundiy AS. Suncountiry. As system C-25214) os sisconding - 25 alk 3 For Incevoruble change, 4 totul > 0 For As total, to should be be greater positive, than As surroundin Tassystem l. . _ os susieundin 25 İlk. Only then as total can greater than

Moss moler of mass Ethanal = of ethanal 4.50 gm 46 glmal male of Ethanal & moss. malar moss 4-50 gin z 0.09& mal- 46 glmal n x Allvap ta 78°c 78 + 273 k. 351 k = 38.56 kalmal ? 38, 560 al mat A cep As vap = 0.098 x 38,560 Ilmal 351k 10.76 2lk.