Plemeniti metali

Submitted by magdalena on Sat, 06/07/2014 - 22:19
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Masa od 15 g plavog kamena(CuSO4*5H2O),rastvorena je u 250cm3 vode.Izracunaj procenat CuSO4 u rastvoru.

Hvala.

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milicaradenkovic - Sun, 06/08/2014 - 09:42

15 g------------------------250 g/mol

x g----------------------------160 g/mol

x=15*160/250=9.6 g CuSO4

mr=m(vode)+ms

m(vode)=ro*V=250*1=250 g

mr=250+9.6=259.6 g

w(CuSO4)=ms/mr=9.6/259.6=0.037=3.7%