Practice problems
1. The first order reaction A products has a t
= 180 seconds.
a. What percentage of the sample remains unreacted after 900 seconds?
b. What is the rate of reaction when [A]=0.50M
2. In 3 different experiments the following results were
[gas ]
( aq ) eq
A=
!
= K H ( pgas ) eq
43
"r
3
" = MRT
"Tb = K b b
"Tf = K f b
!2
c = a2 + b2
QQ
!
!
F ~ 12 2
r
!
q
!
"S = T
T
! #H
#S vap
vap
ln pvap = "
+
RT
T
!
pvap ,solution = X A pvap ,A + X B pvap ,B
Standard Thermodynamic
Functions
Subs tance
Hf