When concentrated H2SO4(l) is added to KI(aq), I2(s) andH2S(g) are formed. When

Question

When concentrated H2SO4(l) is added to KI(aq), I2(s) andH2S(g) are formed. When the equation for this reaction isbalanced, what is the number of electrons transferred? Answer: 8, but how do I do this,pls?          When concentrated H2SO4(l) is added to KI(aq), I2(s) andH2S(g) are formed. When the equation for this reaction isbalanced, what is the number of electrons transferred? Answer: 8, but how do I do this,pls?         

Explanation / Answer

8KI(aq) + 5H2SO4(l)--> H2S(g) +4H2O(l) + 4K2SO4 +4I2The half reaction is    8e- +SO42- + 10H+ --> H2S+ 4H2O              2I- --> I2 + 2e-      =>balance half reaction, the number ofe- transferred is 8

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