Răspuns:
Mg+2HCl⇒2MgCl+H2 ↑
C=md/ms *100
md=c*ms/100=36.5×400/100=146 g HCl
MHCl=1+35.5=36.5 g/mol
2*36.5 g HCl............................2 g de H
146 g de HCl.........................x g de H
x=146*2/2*36.5=4 g deH
MMgCl2=24+2×35,5=95g/mol
2×36,5g 2×95g
Mg + 2HCl ⇒ 2MgCl + H2 ↑
146g ygMgCl2
y=146×2×95/2×36,5=380gMgCl2
Explicație: