Răspuns:
MH2SO4 =2×1+32+4×16=98g/mol
MMgO =24+16=40g/mol
n=m/M
m=nxM=0,1×98=9,8g H2SO4
40g........98g
MgO + H2SO4 => MgSO4 + H2O
xg............9,8g
x=40×9,8/98=4g MgO
calculam in moli
1mol.........1mol
MgO + H2SO4 => MgSO4 + H2O
ymoli........0,1moli
y=1×0,1/1=0,1 moli MgO