北京化工大学：《物理化学》课程教学资源（双语习题课）The Second Law of Thermodynamics

The Second Law of Thermodynamics Tutorial Lecture PDF文件使用"pdfFactory Pro”试用版本创建fm,fineprint.com,cn

1 The Second Law of Thermodynamics Tutorial Lecture PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn f

1.Calculate the difference in molar entropy (a)between liquid water and ice at-5℃， (b)between liquid water and its vapour at 95'C and 101.325kPa.The difference in heat capacities on melting and on vaporization are 37.3JK-1mol-1 and -41.9JK-1mol-1, respectively.Distinguish between the entropy changes of the sample,the surroundings and the total system,and discuss the spontaneity of the transition at the two temperature. PDF文件使用"pdfFactory Pro”试用版本创建m,fineprint.com,cn

2 1. Calculate the difference in molar entropy (a) between liquid water and ice at -5℃, (b)between liquid water and its vapour at 95℃ and 101.325kPa. The difference in heat capacities on melting and on vaporization are 37.3JK-1mol-1 and –41.9JK-1mol-1 , respectively.Distinguish between the entropy changes of the sample, the surroundings and the total system, and discuss the spontaneity of the transition at the two temperature. PDF 文件使用 "pdfFactory Pro" 试用版本创建 fwww.fineprint.com.cn f

2.A sample of 1.00mol of a monatomic perfect gas with Cv.m=3/2R,initially at 298K and 10dm3,is expanded with the surroundings maintained at 298K,to a final volume of 20dm3,in three ways:a) isothermally and reversibly,(b)isothermally against a constant external pressure of 0.5atm,(c )adiabatically against a constant external pressure of 0.5atm.Calculate AS, △Ssurr△H,AT,AA,and△G for each path.lf a numerical answer cannot be obtained from the data,write or -or as appropriate. PDF文件使用"pdfFactory Pro”试用版本创建ffm,fineprint.com,cn

3 2. A sample of 1.00mol of a monatomic perfect gas with CV,m =3/2R, initially at 298K and 10dm3 , is expanded with the surroundings maintained at 298K, to a final volume of 20dm3 , in three ways:( a) isothermally and reversibly, (b) isothermally against a constant external pressure of 0.5atm, (c ) adiabatically against a constant external pressure of 0.5atm.Calculate ΔS, ΔSsurr, ΔH, ΔT, ΔA, and ΔG for each path. If a numerical answer cannot be obtained from the data, write + or -, or ? as appropriate. PDF 文件使用 "pdfFactory Pro" 试用版本创建 fwww.fineprint.com.cn f