The bond energy of an O-H bondis 109 kcal // mol. When a mole of water

1.	The bond energy of an O-H bondis 109 kcal // mol. When a mole of water is formed,then
Answer» 109 kcal is released 218 kcal is released 109 kcal is absorbed 218 kcal is absorbed Solution :Bond ENERGY of O-H bond `=109 kcal // `mol means that whn 1 mole of O-H bondsare formed,109 kcal energy is released ( because dissociationof bond absorbs energy ). Formation of one mole of WATER is equivalent to formation of2moles of O-H bond ( H-O-H) . Hence,energy released `=2 xx 109=218 kcal`. ( Strictly SPEAKING, we CALCULATE`Delta_(f)H^(@) `for the reaction. `H_(2)(g)+(1)/(2) O_(2)(g) rarr H_(2)O(L) .i.e., ( H-O-H)` `Delta_(f)H^(@) =BE(H-H) + (1)/(2) BE(O=O)-2BE(O-H)`

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