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Acidul Clorhidric obtinut prin reactia a 177,5g de clor cu hidrogen se dizolva in apa si se obtine o solutie de concentratie 20% . Masa solutiei=?

Răspuns :

H2 + Cl2 => 2 HCl

m Cl2 = 177.5 g
c HCl = 20%

  71 g Cl2 ....... 2 x 36.5 g HCl
177.5 g Cl2..........a g HCl

a= 177.5 x 2 x 36.5 / 71 = 182.5 g HCl pur
md HCl = 182.5 g
c = 20 %
c= md / ms x 100 => ms = md x100 / c 
ms HCl = 182.5 x 100 / 20 = 912.5 g sol. HCl 20%