Step 1: Calculate total number of electrons:
H 1A 2 x 1 e- = 2 e-
C 4A 1 x 4 e- = 4 e-
O 6A 1 x 6 e- =6 e-
Total: 12 e-
Using Lewis formulas, assign oxidation states to the atoms in
a) H2CO (g)
b) CH3OH (l)
H = (last H)
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