A liquid frezes at 300 K and boils at 400 k kf and kb are 5 and 2.5 C/molal then ratio of latent heat of vaporisation and latent heat of fusion
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12th
Chemistry
Solutions
Colligative Properties and Determination of Molar Mass
If boiling point of aqueous...
CHEMISTRY
If boiling point of aqueous solution is 100.01
o
C. Given latent heat of fusion and vaporization of water are 80calg
−1
and 540calg
−1
respectively. It's freezing point
ANSWER
For a given aqueous solution
ΔT
b
=K
b
×molality
ΔT
f
=K
b
×molality
∴
T
f
ΔT
b
=
K
f
K
b
=
1000l
v
RT
b
2
×
RT
f
2
1000l
f
T
f
ΔT
b
=
T
f
2
×l
v
T
b
2
×l
f
∵T
b
=100+273=373K
T
f
=0+273=273K
l
f
=80 calg
−1
l
v
=540 calg
−1
∴
ΔT
f
0.1
=
273×273×540
373×373×80
ΔT
f
=0.361
∴T
f
=0.0−0.361=−0.361
o
C
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