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2NaCl+K2CO3=Na2CO3+2KCl
Fe(NO)2+K2S=2KNO+FeS
N2O3+2NaOH=Na2O+N(OH)3
Дано
m(Ba(NO3)2=4.66 g
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m(Na2SO4)-?
Xg 4.66 g
Na2SO4+Ba(NO3)2-->BaSO4+2NaNO3
142 261
M(Na2SO4)=142 g/mol
M(Ba(NO3)2)=261g/mol
X/142 = 4.66 / 261
X=2.54 g
ответ 2.54 г
Caco3=CaO+CO2
CO2+2naoh(концентр) = na2co3+h20