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ΔH reaksi = ΣΔH reaktan - ΣΔH produk
= [(1•C=C) + (3•C-H) + (2•O-H)] - [(1•C-C) + (5•C-H) + (1•C-O) + (1•O-H)]
= [(1•607) + (3•410) + (2•460)] - [(1•343) + (5•410) + (1•351) + (1•460)]
= (607 +1230 + 920) - (343 + 2050 + 351 + 460)
= 2757 - 3203
= -446 kJ/mol
Jadi, perubahan entalpinya adalah -446 kJ/mol