Answer
a. +1
b. +1
c. 0
Work Step by Step
1. Determine the number of valence of oxygen:
6 electrons
2. Calculate how many electrons each oxygen 'has' in the bond.
a. 2 + $\frac 12$(6) = 5
b. 2 + $\frac 12$(6) = 5
c. 4 + $\frac 12$(4) = 6
3. Use the equation to calculate the formal charge.
a. 6 - 5 = +1
b. 6 - 5 = +1
c. 6 - 6 = 0
