Question

Calculeaza constanta de viteza la temperatura de 1000 C a reactiei:
2N2O(g)--->2N2(g)+O2(g)
Se cunoaste energia de activare Ea=50kcal/mol, iar k=0.98l*mol^-1*s^-1 la temperatura de 895C.

Answer 1

2N2O => produsi

=> r. de ordin II

k= Ae^(-Ea/RT), unde Ea= 50000 cal---> R = 2 cal/molkelvin\

T = 273 + 895 = 1168 K

prin logaritmare:

lnk1 = lnA - Ea/RT1

lnk2 = lnA - Ea/RT2

lnK2/lnK1 = Ea(1/T2 - 1/T1)

lnK2/lnK1 = 50000(1/1000 - 1/1168)

lnK2/lnK1 = 7,2

=> lnk2 = 7,2xlnk1

= -0,145

=> k2 = e^-0,145 = 2,72^-0,145

K2 = 0,865 l*mol^-1*s^-1