Răspuns:
MgO+H2SO4=H2O+MgSO4
M MgO=24+16=40g/mol
M H2SO4=2+32+16x4=98g/mol
M H2O=2+16=18g/mol
M MgSO4= 24+32+16x4=56+56=120g/mol
40 g MgO.........................18g H2O...........120g MgSO4
16g.....................................x.............................y
x=16x18/40=.....
n1=m/M H2O=x/18
y=16x120/40=.....
n2=y/ M MgSO4=y/120=.........
Explicație:
Scriem mai intai ecuatia reactiei chimice. Apoi lucram pe ecuatia stoechiometrica. Calculele le efectuezi tu!