Mole ConceptHard
Question
Vapourisation of CCl4 occurs reversibly at 27oC and 1 atm
CCl4(l) → CCl4(g) ; ᐃHvap = 42.0 kJ/mole at 27oC and 1 atm
If 1 mole of liquid CCl4 at 27oC has entropy of 214J/K-mole, what is the entropy (in J/K-mol) of 1 mole of vapour in equilibrium with liquid at this temperature.
CCl4(l) → CCl4(g) ; ᐃHvap = 42.0 kJ/mole at 27oC and 1 atm
If 1 mole of liquid CCl4 at 27oC has entropy of 214J/K-mole, what is the entropy (in J/K-mol) of 1 mole of vapour in equilibrium with liquid at this temperature.
Options
A.74
B.454
C.354
D.254
Solution
If liquid CCl4 is in equilibrium with it′s vapour′s them
= ᐃSvap = SCCl4(g) - SCCl4(l)
⇒
= SCCl4(g) - 214J/Kmole
140 + 214 = 354 J/K mole.
= ᐃSvap = SCCl4(g) - SCCl4(l)⇒
= SCCl4(g) - 214J/Kmole140 + 214 = 354 J/K mole.
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