chee 210 tutorial set 6
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5/23/2018 Chee 210 Tutorial Set 6
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CHEE 210 Tutorial Set 6
1. Liquid isobutane is throttled through a valve from an initial state of 360 K, 4000 kPa,
and 132 cm3/mol, to a final state of 2000 kPa. Estimate the temperature change and
the entropy change of the isobutane. The volume expansivity of isobutane can beassumed to be 4.082(10-3) K-1, and its heat capacity is 2.78 J/(g K).
2. Estimate the entropy change of vaporization of benzene at 50C. The vapor pressure of
benzene is given by:
lnPsat
=15.90082788.51
T52.36 where P is in mm Hg, and T in K.
For benzene, = 0.21, Tc= 562.2 K, Pc= 48.98 atm.
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5/23/2018 Chee 210 Tutorial Set 6
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