Respuesta :
Percent by mass of potassium in the initial mixture: 29.8%
solution:
1.913 gm AgCl = mass / molar mass = 1.913 / 143.32 = 0.0133 mole.
let x gm KCl and (0.8870 - x) gm NaCl.
x gm KCl = x / 74.55 mole.
(0.8870 - x) gm NaCl = (0.8870 - x) / 58.5 mole.
x / 74.55 + (0.8870 - x) / 58.5 = 0.0133
x + 1.274 * (0.8870 - x) = 0.0133 * 74.55
x + 1.274 * (0.8870 - x) = 0.9915
0.274 x = 0.1385
x = 0.506 gm
so mass of KCl = 0.506 gm
0.506 gm KCl contains = 39 * 0.506 / 74.55 = 0.265 gm potassium.
% of K = 0.265 * 100 / 0.8870 = 29.8 %
Molar mass:
In chemistry, the molar mass of a compound is defined as the mass of a sample of that compound divided by the amount of substance. This is the number of moles in that sample measured in moles. Molar mass is a mass, not a molecule, a property of matter.
learn more about moles here:
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