Question

5 și 6 va rog mult de tot ​

Answer 1

Răspuns:

se stie     ro=m/v

5.

a.V,apa=150ml----> m,apa= roxV,apa= 150g

b. masa solutiei obtinute= m,apa+m,soda= 150g+70g=220g

ro= V,sol/m,sol=

V.sol= V,apa+10ml= 160ml

ro= 220/160g/ml=1,375g/ml

6.V,apa= 200ml

m,apa= roxV,apa=200g

m,sol.soda= 1,43x300g=429g

V,sol.finala= 200ml+300ml=500ml

a,  m,sol.finala= 200g+429g=629g

b.  ro=m/V= 629/500g/ml=1,258g/ml

Explic