Question

What is the expected value for the heat of sublimation of acetic acid if its heat of fusion is 10.8 kJ/mol and its heat of vaporization is 24.3 kJ/mol

Answer 1

35.1 kJ/mol is the expected value for the heat of sublimation of acetic acid.

Step-by-step explanation:

`CH_3COOH(l)\rightarrow CH_3COOH(g)`..[1]

Heat of vaporization of acetic acid =
`H^o_(vap)=24.3 kJ/mol`

`CH_3COOH(s)\rightarrow CH_3COOH(l)`..[2]

Heat of fusion of acetic acid =
`H^o_(fus)=10.8 kJ/mol`

Heat of sublimation of acetic acid =
`H^o_(sub)=?`

`CH_3COOH(s)\rightarrow CH_3COOH(g)`..[3]

[1] + [2] = [3] (Hess's law)

`H^o_(sub)=H^o_(vap)+H^o_(fus)`

`=24.3 kJ/mol+10.8 kJ/mol=35.1 kJ/mol`

35.1 kJ/mol is the expected value for the heat of sublimation of acetic acid.