# Answer to Question #8479 in Physical Chemistry for witch

Question #8479
Calculate how much (as grams) the following elements are needed to produce a charge equal to the Faraday&rsquo;s constant. Electron charge is 1.602*10^&ndash;19 As
a) Li (using Li/Li+)
b) Zn (using Zn/Zn2+)
1
Expert's answer
2012-04-19T07:38:17-0400
m = (Q/F)*(M/z)

m
is the mass of the substance liberated at an electrode in grams
Q is the total electric charge passed through the substance
F = 96,485 C mol&minus;1 is the Faraday constant
M is the molar mass of the substance
z is the valency number of ions of the substance (electrons transferred per ion)

For Li

m = 1.602*10&ndash;19/96,485 * 6.94/1 = 1.15*10&ndash;20

for Zn

m = 1.602*10&ndash;19/96,485 * 65.38/2 = 5.4277*10-20

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