Respostas

2013-09-17T12:10:51-03:00
H₂S
1.2 + S = 0
S = -2

H₂SO₄
1.2 + S + 4.(-2) = 0
S = 8 - 2
S = +6

Na₂SO₃
1.2 + S + 3.(-2) = 0
S = 6 - 2
S = +4

SO₂
S + 2.(-2) = 0
S = +4