Predict sign of work done in following reactions at constant pressure.
Initial state Final state
(i) \( H _{2} O ( g ) \quad H _{2} O ( l ) \)
(ii) \( H _{2} O ( s ) \longrightarrow H _{2} O ( g ) \)
(iii) \( H _{2} O ( l ) \longrightarrow H _{2} O ( s ) \)
(iv) \( CaCO _{3}( s ) \longrightarrow CaO ( s )+ CO _{2}( g ) \)
