Answered: is the phase diagram of sulphur. At…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter10: Entropy And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 10.64PAE

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is the phase diagram of sulphur. At 95.4˚C, the densities of rhombic and
monoclinic sulphur are 2.07 g cm-3
and 1.96 g cm-3
, whilst the enthalpy change for the
phase transition from rhombic to monoclinic sulphur is 0.3 kJ mol-1
.

i) How many triple points are there?
ii) What is the most stable form of sulphur under normal conditions?
iii) Describe what happens when sulphur at 1 atm is heated from 80˚C to 200˚C.
iv) Determine the volume change ΔV for the transformation from rhombic to
monoclinic sulphur.
v) Estimate the pressure at which rhombic and monoclinic sulphur coexist in
equilibrium at a temperature of 373 K.

153°C,
1420 atm-
Monoclinic
Liquid
95.39°C,
115.21°C,
I atm
I atm
I atm
444.6°C.
1 atm
Rhombie
115.18°C,
3.2 x 10°atm
Gas
95.31°C,
5.1 x 10° atm
Теmрerature
Pressure

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