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Diketahui data energi ikatan:
C - H = 40 Kj/mol
H - H = 45 Kj/mol
C = O = 75 Kj/mol
C - O = 35 Kj/mol
O - H = 50 Kj/mol
Perubahan entalpi pada adisi 1 mol etanal dengan gas hidrogen menurut persamaan tersebut adalah