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Diketahui reaksi penguraian air:
H2O --> H2 + O2 (Belum Setara)
Data Energi Ikatan:
O - H = 35 Kj
H - H = 40 Kj
O = O = 60 Kj
Kalor yang diperlukan untuk menguraikan 4,5 gram air (Mr = 18) adalah ....