Assign an oxidation number to each element in the reaction.
CO(g) + 2H2(g) → CH3OH(g)
In CO, the oxidation number of C is , and that of O is . In H2, the oxidation number of H is . In CH3OH, the oxidation number of C is , that of O is , and that of H is .
In CO, the oxidation number of C is +2 , and that of O is -2. In H2, the oxidation number of H is 0. In CH3OH, the oxidation number of C is -2, that of O is -2, and that of H is +1 .
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