异径接口的型号有KJ25/40、KJ25/50、KJ40/50、KJ40/65、KJ50/65、KJ50/80、KJ65/80等。
举一反三
- 系统吸热50 kJ,环境对系统作功40 kJ;
- For a system, suppose it adsorb 100 kJ of heat from the surroundings and do 50 kJ of work to the surroundings, how much is its internal energy change? A: +150kJ B: -150 kJ C: 50 kJ D: -50 kJ
- 某基元反应热效应△rH =50 kJ·mol[img=17x22]18034b7e8436a38.png[/img]，则该反应的活化能Ea为： A: ≥50 kJ/mol B: <50 kJ/mol C: -50 kJ/mol D: 无法确定
- 4.计算下列各系统的ΔU：(1)系统吸热60 kJ，并对环境作功70 kJ；答：ΔU=60-70=-10kJ(2)系统吸热50 kJ，环境对系统作功40 kJ；答：ΔU=50+40=90kJ(3)Q= -75 kJ，W= -180 kJ；答：ΔU=-75-180=-255kJ(4)Q= 100 kJ，W= 100 kJ。答：ΔU=100+100=200kJ
- 某反应∆rHmӨ= 40 kJ·mol-1，正反应的活化能Ea = 100 kJ·mol-1，则其逆反应的活化能Ea'为( )。 A: Ea' = 60 kJ·mol-1 B: 40 kJ·mol-1<Ea'<100 kJ·mol-1 C: Ea' = 140 kJ·mol-1 D: 100 kJ·mol-1<Ea'<140 kJ·mol-1