Oblicz ile gramów wodorotlenku potasu otrzymanego po odparowaniu do sucha 200cm3 45% roztworu o gęstości 1,45 g/cm3.
V=200cm3 = 0,2 dm3d=1,45g/cm3 = 1450g/dm3Cp= 45 %d= m/Vm=d * Vm=290g - masa roztworuCp= ms * 100% / mrCp * mr = ms * 100%ms= Cp * mr / 100%ms= 45 % * 290g / 100% = 130,5g
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V=200cm3 = 0,2 dm3
d=1,45g/cm3 = 1450g/dm3
Cp= 45 %
d= m/V
m=d * V
m=290g - masa roztworu
Cp= ms * 100% / mr
Cp * mr = ms * 100%
ms= Cp * mr / 100%
ms= 45 % * 290g / 100% = 130,5g