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Submitted by Ana100 on Tue, 03/18/2014 - 18:15
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Izracunaj masu CuSO4x5H2O koju treba rastvoriti u 300g vode da se dobije 15% rastvor CuSO4?
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milicaradenkovic - Tue, 03/18/2014 - 19:53

w(CuSO4)=ms/(ms+m(vode))

0.15=ms/(ms+300)

45=0.85*ms

ms=45/0.85=52.94 g CuSO4

52.94 g------------------------160 g/mol

x g--------------------------------250 g/mol

x=250*52.94/160=82.72 g CuSO4*5H2O