Question

Va rog sa ma ajutati la primele 5 sau 7 exercitii

Answer 1

5. ms=340g
    mapa40g
    Ci=10%
Cf=?
C=(md/ms)x100 -> md=(c x ms)/100=(10x340)/100=34
Cf=[md/(ms-mapa)]x100=(34/340-40)/100=3400/300=11,33%

Answer 2

1. ms₁ = 2400g
c₁= 10%
mapaevap =400g
c = ?

c₁ =md/ms₁ x100 

md = c₁ xms₁/100
md = 10 x2400/100
md= 240g
ms = ms₁ - mapaevap
ms = 2400g - 400g
ms = 2000g
c = md/ms x100
c = 240/2000 x100
c = 12%

2. c= 0,85%
    ms = 10kg
md =?
mapa=?
c = md/ms x100
md = cx ms/100
md = 0,85 x 10/100
md = 0,085kg clorura de sodiu (sare de bucatarie)
ms = md + mapa
mapa = ms - md
mapa = 10- 0,085
mapa = 9,915kg
3.
ms₁ = 900g
c₁ = 20%₁
mzahar adaugat₁= 100g
c =?
c₁ = md₁/ms₁ x100
md₁ = c₁x ms₁/100
md₁ = 20x900/100
md₁ = 180gzahar
c = md/ms x100
md = md₁ + mzahar ad
md = 180+ 100
md=280g zahar
ms = ms₁ + mzahar ad
ms = 900 + 100
ms =1000g
c = 280/1000 x100
c = 28%
4.
md = 1200gzahar
mapa = 1380g
c =?
ms = md + mapa
ms = 1200g + 1380g
ms = 2580g
c = md/msx100
c= 1200/2580 x100
c = 46,51%
5. ms₁ = 340g
c₁ = 10%
mapaevap = 40g
c₁ = md/ms₁x100
md = c₁xms₁ /100
md = 10 x 340/100
md=34g alcool
c = md / ms
ms = ms₁ - mapaevap
ms = 340g - 40g
ms = 300g
c = 34/300x100
c = 11,33%
6. ms₁ = 1400g
c₁ = 10%
ms₂ = 600g
c₂=12%
c= ?
c₁ = md₁/ms₁ x100
md₁ = c₁ xms₁/100
md₁ = 10 x1400/100
md₁ = 140g
c₂ = md₂ /ms₂ x100
md₂= c₂xms₂ /100
md₂ = 12x600/100
md₂ = 72g
c = md /ms x100
md = md₁ + md₂
md = 140+72
md = 212g
ms = ms₁ + ms₂
ms = 1400+ 600
ms = 2000g
c = 212/2000 x100
c = 21,2%
7. Vsol = 800ml
ρ=1,2g/ml
c₁ =20%
m sareadaugata = 40g
c = ?
ms₁ = ρ · Vs
ms₁ = 800 x1,2
ms₁ =960g
c₁ = md₁ / ms₁x100
md₁ = c₁xms₁/100
md₁ = 20x960/100
md₁ =192g sare
c = md /msx100
md = md₁ + msaread
md = 192 + 40
      = 232g sare
ms = ms₁ + msaread
ms= 960+ 40
      = 1000g
c = 232/1000 x100
c =23,2%

ms₁ = 2400g
c₁=10%
mapaevap = 400g
c= ?
c = md/msx100
ms = ms₁ - mapaevap
ms = 2400-400
      = 2000g
c₁ = md/ms₁x100
md = c₁xms₁/100
md = 10x2400/100
md = 240g
c = 240/2000x100
c = 12%