1.

Given: Delta_(f)H^(@) (kJ//mol)"" S_(m)^(@)(J//K mol) {:(CCl_(4)(l), -135 A, 215 A),(CCl_(4)(g), -103.0, 308.7):}: What is the boiling point of carbon tetrachloride?

Answer»

`8.25^(@)` C
`74.3^(@)` C
`92.3^(@)` C
`45.8^(@)` C

Solution :`"CC"l_(4) , "CC"l_(4)(g)`
`{:(Delta_(F)H^(@), -135A, -103.0, Delta_(r)H^(@) = -103 -(-135.4)=32.4 kJ//mol),(S_(m)^(@), 215.4, 308.7, Delta_(r)S^(@) = 308.7-215.4= 93.3 J//K mol):}`
`T_("boiling") =(Delta_(r)H^(@))/(Delta_(r)S^(@)) = (32.4 xx 10^(3))/(93.3) = 347.3 K = 74.3^(@) C`


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