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amestecând 245g acid sulfuric cu 255g apa se obtine o solutie.C%??

Răspuns :

md=245g
mapa=255g
-------------------
c%=?
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ms=md+mapa=>ms=245g+255g=>ms=500g
c/100=md/ms=>c/100=245g/500g=>c=100x245g/500g =>c=24500g/500g=>c=245g/5g=>c=49%