Question

. Using the information below. answer this question.
Fe.0,(s) + 3H:19) ► Fe(s) + 3H.0(9) Ah = +96 kJ mot, ASⓇ = +138 J K mol
Fe,o(s)
H (9)
Fe(s)
ΔΗ,
/kJ mot
-822.0
0
0
AS I J K mot:
90.0
131.0
27.0
The standard enthalpy of formation of steam is
A
+286 kJ mol-
B В
+242 kJ mol-
с
-242 KJ mol
D
-286 kJ mol-
CUTTITODIC 5
Page 5

Answer 1

HX →H

+

+X

−

weak acid          0         0

1-a                       a         a

a = 20% dissociation

i=(1−a)+a+a=1+a=1+0.2=1.2

ΔT

f

​

=i×K

f

​

×m

=1.2×1.86×0.5

=1.12K