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Ca+2H2O=Ca(OH)2+ H2
mKOH=39+16+1=56
mCa(OH)2=40+32+2=74
K2O+H2O --> 2KOH
m KOH= 39u+16+ 1=56u
wodorotlenek wapnia
CaO + H2O -->Ca(OH)2
mCa(OH)2= 40u+2*16u+2*1u=40i+32u+2u=74u