A solution of an unknown divalent metal ion, M²⁺

CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

A solution of an unknown divalent metal ion, M²⁺, is electrolyzed with a steady current of 0.750 A for 25.0 min. The cathode gains 0.843 g of the metal. Based on these data, what is the best estimate of the molar mass of the metal? (a) 73 g mol−173\ \text{g mol}^{-1} (b) 290 g mol−1290\ \text{g mol}^{-1} (c) 145 g mol−1145\ \text{g mol}^{-1} (d) 97 g mol−197\ \text{g mol}^{-1}

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