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MKCl= 74,5g/mol
2×58,5+3×74,5=340,5g - masa molowa soli
117 - 340,5g
x - 20g
x=6,9g -masa NaCl
223,5 - 340,5g
x - 20g
x=13,1g - masa KCl
Cp₁= 6,9/320×100% = 2%
Cp₂=13,1/320×100% = 4,1%