A silver spoon needs a coat of 2.50 g of silver…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A silver spoon needs a coat of of silver. It is plated from silver nitrate solution with a steady current of . The molar mass of silver is . How long does the plating take, in seconds and in minutes?
Need a reminder? The key ideaShow
, with the time in seconds, and . For , the mass is . The same charge through different cells gives masses in the ratio of . At and one mole of gas is .
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.
Given. , , and for .
Step 1. Moles of silver. .
Step 2. Charge. One electron for each atom, so .
Step 3. Time. .
Step 4. Minutes. .
Answer: , which is .
Discussion (0)
Log in to join the discussion.
Loading…