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Given: Delta(f)H^(@) (kJ//mol) " ...

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?

A

`8.25^(@)` C

B

`74.3^(@)` C

C

`92.3^(@)` C

D

`45.8^(@)` C

Text Solution

Verified by Experts

The correct Answer is:
B
`"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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