2K2CrO4 + 8H2O + 3Mn => 3Mn(OH)2 + 2Cr(OH)3 + 4KOH
Ca⁺²C⁺⁴O⁻²₃+2H⁺¹N⁺⁵O⁻²₃-->Ca⁺²(N⁺⁵O⁻²₃)2+H⁺¹₂O⁻²+C⁺⁴O⁻²₂
Mr(CaCO3)=40+12+16*3=100
Mr(HNO3)=1+14+16*3=63
M(Ca(NO3)2)=40+(14+16*3)*2=164
Ba+2H2O=Ba(OH)2+H2
BaO+H2O=Ba(OH)2
3Ba(OH)2+P2O5=Ba3(PO4)2+3H2O
2Cr(OH)3=Cr2O3+3H2O
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