1.57 calculate the amounts of the products of the electrolysis of molten salts and aqueous solutions.

CALCULATIONS:

- If 2.5 amps are passing through sodium chloride for 15 minutes. What mass of sodium do we get?

- 1. Write out the half-equation:
2H+ + 2e- -> H2

- Calculate number of faradays.
Q = IxT
Q = 2.5 x (15 x 60 = 900) = 2250 coulombs.
Faradays = Q / FQ
Faradays = 2250 / 96000 = 0.0234375 F

- Calculate number of moles of sodium produced.
Moles = Faradays / (Electrons in half-equation)
0.0234375 / 2 = 0.01171875 moles of sodium atoms.

- Calculate Mr to workout mass.
Mass of sodium = Mr x Moles
23 x 0.01171875 = 0.26953125 = 0.27 g

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