Fe2O2=56*2+16*2=144
BaCl2=137*1+35,5*2=208
<span>Cr(OH)3+NaOH = NaCrO2 + 2H2O</span>
Cr(OH)3+Na (+) + <span><span>OH(-) = Na (+) + CrO2(-) + 2H2O</span>
</span>Cr(OH)3 +<span>OH(-) = </span><span><span>CrO2(-) + 2H2O </span></span>
<span>NH4Cl+NaOH=NaCl+NH4OH </span>