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<r> = m/v
m=<ro>*v
mKCl = 74,5g
0,02mol - 1 dm3
1 mol - 74,5g
<ro> = 1,02g/cm3
m = 1000cm3 * 1,02g/cm3 = 1020g
74,5g - 1020g
x - 100g
x = 7,3g
Odp. Stężenie procentowe wynosi 7,3%