101.325kPa,1mol的-5℃过冷液态苯变成-5℃固体苯的ΔS为:(已知苯的正常凝固点为5℃,在凝固点时的熔化热为9940J/mol,液态苯及固态苯的平均恒压摩尔热容分别为135.77J/(K·mol)、123 J/(K·mol))。( )
A. 35.30J/K
B. -35.30J/K
C. -35.62J/K
D. -35.76J/K
查看答案
101.325 kPA. 298 K时,化学反应Zn(s) + CuSO4(aq) = Cu(s) + ZnSO4(aq)放热216.8 kJ,若将该反应放在可逆原电池中进行,做电功91.6 kJ,计算此过程的Q:( )
A. -216.8kJ
B. -308.4kJ
C. 125.2kJ
D. -125.2kJ
298K时,化学反应2SO3(g)=2SO2(g)+O2(g)的ΔrGm=140kJ/mol,反应的ΔrHm=196.6kJ/mol,600℃的ΔrGm为: ( )
A. 30.8 kJ/mol
B. -30.8 kJ/mol
C. 79.6 kJ/mol
D. -79.6 kJ/mol
298K时,100kPa时水的蒸气压为3168Pa,已知反应:H2(g)+1/2O2(g)=H2O(l)的ΔrGm⊖=-237.129kJ/mol,则反应:H2(g)+1/2O2(g)=H2O(g)的ΔrGm⊖为:( )
A. -228.572 kJ/mol
B. -245.686 kJ/mol
C. -240.297 kJ/mol
D. -233.961 kJ/mol
300K温度下,1mol理想气体从600kPa向真空膨胀到100kPa,该过程的熵变ΔS:( )
A. 0 J/K
B. -14.90 J/K
C. 14.90 J/K
D. -4469 J/K