反应转化率和反应程度 反应程度 反应各组分在反应前后摩尔数的变化与其计 量系数的比值,即: 8=220 ■不论对哪一组分,反应程度均相同
反应转化率和反应程度 ◼ 反应程度 ◼ 反应各组分在反应前后摩尔数的变化与其计 量系数的比值，即： ◼ 不论对哪一组分，反应程度ξ均相同。 i ni ni − = 0
反应转化率和反应程度 n以反应程度表示的反应速率 1 ds y at
反应转化率和反应程度 ◼ 以反应程度表示的反应速率 dt d V r = 1
等容反应下的反应速率 对等容反应而言,V=V= const A0 →CA=C0(1-xA 1 dn AO 4 dt dt dc A0 dt
等容反应下的反应速率 ◼ 对等容反应而言，V =V0 =const dt dC dt V n d dt dx C dt dx V n dt dn V r C C x n n x A A A A A A A A A A A A A A = = − = − − = − = = − = − ( ) 1 (1 ) (1 ) 0 0 0 0
Example, THE rocKET ENGIne A rocket engine burns a stoichiometric mixture of fuel ( liquid hydrogen) in oxidant iquid oxygen). The combustion chamber is cylindrical 75cm long and 60cm in diameter, and the combustion process produces 108kg/s of exhaust gases. If combustion is complete find the rate of reaction of hydrogen and of oxygen
Example, THE ROCKET ENGINE ◼ A rocket engine burns a stoichiometric mixture of fuel (liquid hydrogen) in oxidant (liquid oxygen). The combustion chamber is cylindrical, 75cm long and 60cm in diameter, and the combustion process produces 108kg/s of exhaust gases. If combustion is complete, find the rate of reaction of hydrogen and of oxygen
Complete com bustion 2 60 108 kg/s H2o 2 75cm
Complete combustion H 2 O 2 60cm 75cm 108 kg/s H2O