Oblicz stężenie procentowe roztworu otrzymanego po rozpuszczeniu 1kg lakieru w 10dm3 acetonu. Gęstość acetonu wynosi 0,79g/cm3
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ms = 1kg
mr = 0,79g/cm³*10dm³+1kg = 0,79g/cm³*10000cm³+1kg = 7900g+1kg = 7,9kg+1kg = 8,9kg
Cp = (1kg/8,9kg)*100% = (100/8,9)% ≈ 11,24%
Cp=ms/mr*100%
v=10dm3
d=m/v
m=d*v
m=o,79g/cm3*10dm3=790g/dm3*10dm3=7900g
1kg=1000g
ms=1000g
mr=7900g+1000g=8900g
Cp=1000g/8900g*100%=11,23%=11,24%