Na2CO3+2HCl=2NaCl+CO2+H2O
K2SO3+2HNO3=2KNO3+SO2+H2O
FeS+2HCl=H2S+FeCl2
Образовалось 16 грамм кислорода
<span>Б. 8HNO</span>3<span> (разб.) + 3Cu = 3Cu(NO</span>3<span>)</span>2<span> + 2NO↑ + 4H</span>2<span>O</span>
<span><span>В. 3Ag + 4HNO</span>3<span> (разб.) = 3AgNO</span>3<span> + NO↑ + 2H</span>2<span>O</span></span>
<span>точно!</span>