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800g de solutie de sare de concentratie 25% pierde prin evaporare 200g de apa. Care este concentratia procentuala a solutiei ramase dupa evaporare ?

vreau cu calculee, mersi.


Răspuns :

ms1=800g
c1=25%
m apa2=200g
md1=c×ms÷100=800×25÷100=200g
m apa1=800g- 200g =600g
m apa3=600g-200g=400g
ms3=800g-200g=600g
md3=200g
c3=100×md÷ms=20000g÷600g=33,33%