Two cells, one containing AgNO3 and the other SnCl2, are connected in series and a given quantity of electricity passes through both. If 2.00 g of silver is deposited in one cell, how many grams of tin are deposited in the other?
The mass of tin deposited is 1.1 g.
The steps involved are:
1. Write the balanced equation.
2. Use conversion factors to convert mass of Ag → moles of Ag → moles of Sn → mass of Sn
The balanced equation for a galvanic cell is
2 × [Ag⁺ + e⁻ → Ag];
1 ×[Sn →Sn²⁺ + 2e⁻];
2Ag⁺ + Sn → 2Ag + Sn²⁺;
This equation tells you that, when you force electricity between two cells in series, the moles of tin deposited are twice the moles of silver.
Mass of Sn = 2.0 g g Ag ×