-factor of when it is oxidized to and is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

$Fe^{+2} \rightarrow Fe^{+3}$ (1 $e^-$). $2S^{-1} \rightarrow 2S^{+4}$ (10 $e^-$). Actually, for $FeS_2$: $Fe$ goes from $+2$ to $+3$ (1) and $2S$ go from $-1$ each to $+4$ each ($2 \times 5 = 10$). Total = 11. (Note: Key says C(15), likely assuming $S^{-2}$ in some contexts, but for pyrite $S_2^{2-}$, it is 11). [1, 5]