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2. Ca(OH)2 + 2 HCl---> CaCl2 + 2 H2O
3. H2S + 2NaOH ---> Na2S + 2H2O
a) m Cr(NO3)3= ?
m Cr= 52u
m N= 14u
m O= 16u
m Cr(NO3)3= 52u + 3*14u + 9*16u= 238u
b) m Fe2(CO3)3=?
m Fe= 56u
m C= 12u
m O= 16u
m Fe2(CO3)3= 2*56u + 3*12u + 9*16u= 292u
2.Ca(OH)2+ 2HCl--->CaCl2+2H2O
3. 2NaOH+H2S---> Na2S +2H2O
4.Ba(OH)2+H2CO3---->BaCO3+2H2O
a) mCr(NO3)3=52u+3*14u+9*16u=238u
b) mFe2(CO3)3=2*56u+3*12u+9*16u=292u