Arkansas State University Department of Chemistry and Physics

1. Using bond energies, calculate the DH_rxn for each of the following:

a)   2 H_{2 (g)}   +   O_{2 (g)}  ------->  2 H₂O _(l)
 

b) CH_{4 (g)}  +    2 O_{2 (g)}  ------->     CO_{2 (g)}   +   2 H₂O _(l)
 
 
 

Bond type	Bond Energy, kJ/mol	Bond type	Bond Energy, kJ/mol
H - H	436	C - O	358
O - O	146	C = O	799
O = O	498	C - H	413
O- H	463

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