pt = (pi – x) + x + x = pi + x
x = (pt - pi)
where,  pA  = pi – x = pi – (pt – pi)
 = 2pi – pt
 k = 
i
A
2 303
log p
p
t










(3 16)
= 


i
i
t
2 303 log 2
p
p
p
t

The following data were obtained during the first order thermal
decomposition of N2O5 (g) at constant volume:
( )
( )
( )
2
5
2
4
2
g
g
g
2N O
2N O
O
→
+
S