Identify the state function and path functions.
(a) The change in potential energy when a book is transferred from table to shelf.
(b) The heat evolved when a cube of sugar is oxidized to `CO_(2(g))` and `H_(2)O_((g))`.
(c ) The work accomplished in burning a litre of gasoline.

Explanation

(a) Potential energy is state function.
(b) Heat is a path function because a part of it may be used in work.
(c ) Work is not a state function.