Question
Open system and Isolated system :
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| Compound | $\Delta_{ f } H ^0 KJ mol ^{-1}$ |
| $CaO _{( s )}$ | $-635.1$ |
| $Al _2 Cl _{6( s )}$ | $-1300$ |
| $C _2 H _6( g )$ | $-84.7$ |
| $CH _3 COOH _{( l )}$ | $-484.7$ |
| $C _2 H _5 OH _{( l )}$ | $-277.7$ |
| $NaNO _{3( s )}$ | $-950.8$ |