MediumChemistryHigh School (11–12)Redox Reactions › Oxidation Number and Types of Redox ReactionsNumericalA-LevelAPIBNEET
In a Daniell cell, 0.327 g of zinc dissolves…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In a Daniell cell, of zinc dissolves. How many moles of electrons pass through the wire? What charge is that, in coulombs? For how many seconds would a current of have to flow to carry this charge?
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. Zinc. .
Step 2. Electrons. Two for each atom, so .
Step 3. Charge. .
Step 4. Time. , which is about hours.
Answer: of electrons, , and .
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