Find the correct stoichiometric coefficients in the following redox equation: \(xH^+ + yC_6H_5CH_3 + wMnO_4^- \longrightarrow aH_2O + bMn^{2+} + tC_6H_5COOH\) |
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The correct answer is option 1.
Let us break down the redox equation and the process of balancing it: 1. Oxidation half-reaction: \( C_6H_5CH_3 \rightarrow C_6H_5COOH \) 2. Reduction half-reaction: \( MnO_4^- \rightarrow Mn^{2+} \) Now, let's balance each half-reaction: 1. Oxidation half-reaction: The oxidation state of carbon in methylbenzene (\(C_6H_5CH_3\)) changes from 0 to +2 in benzoic acid (\(C_6H_5COOH\)). So, 2 electrons are involved in the oxidation half-reaction. \[ 5C_6H_5CH_3 + 14H^+ + 14e^- \rightarrow 5C_6H_5COOH + 14H_2O \] 2. Reduction half-reaction: The oxidation state of manganese changes from +7 to +2. To balance the charges and atoms, we need 12 electrons. \[ 6MnO_4^- + 18H^+ + 12e^- \rightarrow 6Mn^{2+} + 10H_2O \] Now, let's combine the half-reactions and balance the coefficients: \[ 18H^+ + 5C_6H_5CH_3 + 6MnO_4^- \rightarrow 14H_2O + 6Mn^{2+} + 5C_6H_5COOH \] Comparing the coefficients, we find that they match the coefficients: \[ x = 18, \quad y = 5, \quad w = 6, \quad a = 14, \quad b = 6, \quad t = 5 \] Therefore, option 1 is the correct choice for the stoichiometric coefficients that balance the given redox equation. |