A chemistry problem by Mateus Gomes

Chemistry Level 3

\[\ce{[Cr(N_2H_4CO)_6]_4[Cr(CN)_6]_3 + KMnO_4 +H_2SO_4 -> \, K_2Cr_2O_7 + KNO_3 + CO_2 + MnSO_4 +H_2O + K_2SO_4} \]

Calculate the sum of the stoichiometric coefficients.

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