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Assign oxidation numbers to each atom in the following combustion reactions and then tell which combustion reaction is?
is most efficient and which combustion reaction is least efficient:
C8 H18 + 17/2 O2 ⇨ 8 CO + 9 H2O
C8 H18 + 9/2 O2 ⇨ 8 C + 9 H2O
C8 H18 + 25/2 O2 ⇨ 8 CO2 + 9 H2O
1 Answer
- 冷眼旁觀Lv 72 years ago
___________________C8 H18 + (17/2) O2 → 8 CO + 9 H2O
Oxidation number: __-2.25 +1 ________ 0 ___ +2 -2 __ +1 -2
___________________C8 H18 + (9/2) O2 → 8 C + 9 H2O
Oxidation number: __-2.25 +1 _______ 0 ____ 0 ___ +1 -2
__________________C8 H18 + (25/2) O2 → 8 CO2 + 9 H2O
Oxidation number: _-2.25 +1 ________ 0 ____+4 -2 __ +1 -2
The third reaction is the most efficient because the increase in oxidation number of C is the greatest (from -2.25 to +4).