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a) H2 S
AZUFRE: -2
+1 +x -2
b) Na2S O4
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+2 +x -8 = 0
+x = +8 -2 = +6
AZUFRE: +6
+2 +x -2
c) Ca S O3
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+2 +x -6 = 0
+x =+6 -2 = +4
azufre: +4
+1 +1+x -2
d) K H S O3
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+1+1+x-6=0
+2 +x -6 = 0
+x = +6 -2 = +4
azufre: +4