да идет Ca<span>(</span>OH<span>)</span>2<span>+</span>2HNO3<span>-></span>Ca<span>(NO3)</span>2<span>+</span>2<span>H</span>2O
C+2H2=CH4
CH4+O2=CH2O+h2O
CH2O+Ag2O=CHOOH+2Ag
2KCl+3O2->2KClO3
2CO+O2->2CO2
Na2O+2KCl->2NaCl+K2O
Na2O+2AgNO3->2NaNO3+Ag2O
Na2O+2HNO3->2NaNO3+H2O
KCl+AgNO3->KNO3+AgCl
2KCl+Mg(OH)2->2KOH+MgCl2
AgNO3+Mg(OH)2->AgOH+Mg(NO3)2
2HNO3+Mg(OH)2->Mg(NO3)2+2H2O
CaO+2KCl->CaCl2+K2O
CaO+2AgNO3->Ca(NO3)2+Ag2O
CaO+2HNO3->Ca(NO3)2+H2O
Ответ:0,3 * 6,02*10^23 штук