Răspuns: Mg O +2 HCl =MgCl2 + H2O
40g 2.36,5g
MMgO=24+16=40------> 1mol=40g Se calc.puritatea MgO:
MHCl=1+ 35,5=36,5------>1mol=36,5 g 150.90: 100=135 g MgO
x=135.2 . 36,5 : 40= 246,375 g HCl (acesta este md solutiei)
c= md .100 : ms
ms=md .100: c
ms=246,375 .100 : 50= 492,750 g sol. HCl