Question

Se amesteca 50g solutie de concentratie 40% cu 150g de solutie de concentratie 50% cu 200g de solutie de concentratie 60% si cu 400 substante cf=? va rog mult e pentru maine 

Answer 1

datele problemei:
ms₁=50g
c₁=40%
ms₂=150g
c₂=50%
ms₃=200g
c₃=60%
ms=400g
cf=?

rezolvare:
c₁=md₁/ms₁*100
40=md₁/50*100
md₁=20g

c₂=md₂/ms₂*100
50=md₂/150*100
md₂=75g

c₃=md₃/ms₃*100
60=md₃/200*100
md₃=120g

mdf=md₁+md₂+md₃=20+75+120=215g
cf=mdf/ms*100
cf=215/400*100
cf=53.75%