What is the oxidation number for s in the compound so3? (recall that o has an oxidation number of –2.) 0 +2 +4 +6

The compound So3 is neutral. This means that the total charge on the compound is zero.

Now SO3 has 1 S and 3 O.
Recalling that O has an oxidation number of -2, this means that the 3 O in SO3 would have a total oxidation number of 3*-2 = -6

Now, as mentioned before, the total charge of SO3 is zero. This means that the total positive charge is equal to the total negative charge.

Total charge of SO3 = charge on S + charge on O3
0 = charge on S - 6
Charge on S = +6

The answer is d. +6
(i got it right on my quiz)

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)