Răspuns:
Explicație:
Hristos a inviat!
Date
ms=20g solutie HCl
ω = 7,3%
Cerinta
m MgO=?g
Rezolvare
ω/100 = md/ms⇒md = ω×ms/100
md = 7,3×20/100⇒md = 14,6/10=1,46 g HCl
40 2×36,5
MgO + 2HCl → MgCl₂ + H₂O
a 1,46
a = 40×1,46/2×36,5 =0,08g MgO
M MgO=24+16=40 g/mol, M HCl=1+35,5=36,5 g/mol
