Asked by bme1

2H2 + O2 yield 2H2O
to calculate bond enthalpy, we have to take bond breaking minus bond making, how do we know which one is bond breaking and bond making
Answered by DrBob222
Isn't it obvious? You are breaking a H-H bond and a O-O bond. You are making two O-H bonds x 2 (four O-H bonds). .
Answered by Anonymous
-485
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