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Mg(OH)2 + H2SO4 -> MgSO4 + 2H2O
MgO + H2SO4 -> MgSO4 + H2O
CaSO4*2H2O
M CaSO4= 40+32+4*16= 136
M 2H2O = 2*(2*1+16)=36
136+36=172
%H2O = 36/172*100%=20,93%
CaCO3===ΔT===> CaO + CO2
CaO + H2O ===> Ca(OH)2