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2C+2H2→C2H4 ▲H = +51,8 kj
2C+3H2→C2H6 ▲H = -84,5 kj
dit : ▲H utk reaksi : C2H4+H2→ C2H6 jb : C2H4→2C+2H2 ▲H = -51,8 kj 2C+3H2 →C2H6 ▲H = 84,5 kj ------------------------------------------------- C2H4+H2→ C2h6 ▲H = +32,7