MediumChemistryHigh School (11–12)Redox Reactions › Oxidation Number and Types of Redox ReactionsNumerical
A Daniell cell supplies a steady current of 30 mA for 90 minutes…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A Daniell cell supplies a steady current of for minutes. The molar masses are for zinc and for copper. Find the mass of zinc that dissolves and the mass of copper that is deposited.
Need a reminder? The key ideaShow
A half-cell is a metal in a solution of its ions. In a cell that makes electricity, the anode is where oxidation happens and is negative, and the cathode is where reduction happens and is positive. Electrons go from anode to cathode in the wire. and one mole of electrons carries .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Charge. .
Step 2. Moles of electrons. .
Step 3. Zinc. The moles of zinc are half of that. .
Step 4. Copper. In the same way, .
Answer: of zinc dissolves and of copper is deposited. Copper is slightly lighter because its molar mass is a little smaller.
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