Mr(HNO3)=Ar(H)+Ar(N)+Ar(O)*3=1+14+16*3=63
w%(H)=(Ar(H)/Mr(HNO3))*100%=(1/63)*100%=1,59%
w%(N)=(Ar(N)/Mr(HNO3))*100%=(14/63)*100%=22,22%
w%(O)=(Ar(O)*3/Mr(HNO3))*100%=(16*3/63)*100%=76,19%
FeCl₃ + 3AgNO₃ = 3AgCl↓ + Fe(NO₃)₃
NaOH + HCl = <span>NaCl + H2O
</span><span>Na2CO3 + CaCl2 = CaCO3 + 2NaCl
</span><span>CaCO3 + 2HNO3 =Ca(NO3)2+ H2O +CO2</span>
1) H2+ Cl2--->2HCl; 2) 2Na+ Cl2-->2 NaCl; 3) 2FeCl2+Cl2-->2FeCl3; 4) FeCl2+ 2Na-->2NaCl + Fe