The standard molar formation enthalpies of (A+)2Cd2(SO4)3[A+is NH-4+or K+ ] are determined from the enthalpies of dissolution (ΔSHm) of [(A+)2SO4(s)+ 2CdSO4(s)] and (A+ )2Cd2(SO4)3(s) in twic...The standard molar formation enthalpies of (A+)2Cd2(SO4)3[A+is NH-4+or K+ ] are determined from the enthalpies of dissolution (ΔSHm) of [(A+)2SO4(s)+ 2CdSO4(s)] and (A+ )2Cd2(SO4)3(s) in twice distilled water or 3 mol· L- 1 HNO3 solvent respectively,at 298.2 K,as: Δ fHm[(NH4)2Cd2(SO4)3,s,298.2K]=- 3031.74± 0.08 kJ· mol-1 Δ fHm[K2Cd2(SO4)3,s,298.2K]=- 3305.52± 0.17 kJ·展开更多
基金the National Natural Science Foundation of China(21273171,21127004,21173168)Scientific Research Program Funded by Shaanxi Provincial Education Department,China(11JK0578,11JS110)~~
文摘利用精密绝热热量仪测定了配合化合物Zn(Met)_3(NO_3)_2·H_2O(s)(Met=L-α-蛋氨酸)在78-371 K温区的摩尔热容.通过热容曲线解析,得到了该配合物的起始脱水温度为T_D=325.10 K.将该温区的摩尔热容实验值用最小二乘法拟合得到了摩尔热容(C_p)对约化温度(T)的多项式方程,由此计算得到了配合物的舒平热容值和热力学函数值.基于设计的热化学循环,选择100 mL 2 mol·L^(-1)HCl溶液为量热溶剂,利用等温环境溶解-反应热量计,得到了298.15 K配合物的标准摩尔生成焓Δ_f H_m^0[Zn(Met)_3(NO_3)_2·H_2O,s]=-(1472.65±0.76)J·mol^(-1).
文摘The standard molar formation enthalpies of (A+)2Cd2(SO4)3[A+is NH-4+or K+ ] are determined from the enthalpies of dissolution (ΔSHm) of [(A+)2SO4(s)+ 2CdSO4(s)] and (A+ )2Cd2(SO4)3(s) in twice distilled water or 3 mol· L- 1 HNO3 solvent respectively,at 298.2 K,as: Δ fHm[(NH4)2Cd2(SO4)3,s,298.2K]=- 3031.74± 0.08 kJ· mol-1 Δ fHm[K2Cd2(SO4)3,s,298.2K]=- 3305.52± 0.17 kJ·