Question

200g de acid clorhidric de concentratie 1,825% reactioneaza cu macneziu gate grame si cati moli de produsi de reactie avem ?

Answer 1

Mg + 2 HCl = MgCl2 + H2
M HCl = 1+35,5 = 36,5
M MgCl2 = 24+2*35,5 = 95
M H2 = 2*1 = 2
c = md/ms*100
md = 1,825*200/100 = 3,65 g HCl
2*36,5 g HCl.....95 g MgCl2.....2 g H
36,5 g HCl...............x..................y
x = 47,5 g MgCl2
n MgCl2 = 47.5/95 = 0.5 moli MgCl2
y = 1 g H
n H2 = 1/2 = 0,5 moli H2