Here's a perfect example of a stable and unstable system.
A rock is at the top of a 20m tall hill. The rock has a mass of 10kg. How much potential energy does the rock have?
2 answers:
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Answer: The amount of Zn plated from a solution is 1.07× grams.
Explanation: In this question, it is given that of 317.7 coulombs was used in an electrolytic cell, i.e,
The amount of charge = 317.7 coulombs
The amount of charge of 1 mole of electrons = 96485.3 coulombs ( FARADAY’S CONSTANT )
Now, the number of electrons = amount of charge given / charge of 1 mole of electrons
The number of electrons = =
×
According to reaction occurring, 2 moles of electrons are required to convert 1 mole of to Zn which is plated on the electron, so the moles of Zn plated will be half the moles of electrons, i.e.,
= 1.645×
Now, we know that the molar mass of zinc is 65.38gm/mole,
Number of moles = mass in grams / molar mass
Mass in grams = number of moles × molar mass
Mass in grams = (1.645×) × 65.38 = 0.1075 gm.
Conclusion: It concludes that the amount of Zn plated from a 1.07× solution is gm.