Question

Se amesteca 300g de alcool 60% cu 400 g solutie de alcool 50%. Calculeaza concentruatia procentuala a solutiei obtinute dupa amestec.

Answer 1

100/60=300/x;     x=180g=m1
100/50=400/x;     x=200g=m1

wtotal=((m1+m2)/msol.total)*100=(380/700)*100=54,28%

wtotal=54,28%