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d(r)=1,15g/cm³
c(p)=20%
m(s)=?
d=m/V => m=d*V
m(r)=1,15g/cm³ * 1000cm³ = 1150g
1150g r - 100%
xg s - 20%
x=20%*1150g / 100%=230g
Odp. Należy rozpuścić 230g soli kamiennej.