1.

The heat of vaporisation : Delta H_("vap"), of C Cl_(4) at 27^(@)C is 42 kJ/mole C Cl_(4)(l) rarr C Cl_(4) (g) : Delta H_("vap") = 42.0 kJ//"mole" If 1 mole of liquid CCl_(4) at 27^(@)C has entropy of 214 J/K mole, what is the entropy (in J/K-mol) of 1 mole of vapour in equilibrium with liquid at this temperature.

Answer»

74
454
354
254

Solution :If liquid `C Cl_(4)` is in EQUILIBRIUM with it's vapour's them
`(DeltaH_("VAP "27^(@)C))/(300)=DeltaS_("vap")=S_(C Cl_(4)(g))-S_(C Cl_(4)(l))`
`rArr (42, 000)/(300)=S_(C Cl_(4)(g))-214" J/K mole"`
`140+214=354" J/K mole"`


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