81. Решение задачки по химии №7

17. Two parallel reactions occur in the system: A + 2B → (k1) D, A + 2C → (k2) F. The ratio k1/k2 = 5. The initial concentrations of substances B and C are the same. By the time t, 50% of substance B has reacted. What part of substance C has reacted by this time?

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