2NaOH + H2SO4= Na2SO4 + 2H2O
30г(30%) 30г(30%) N-?
HCI + NaOH = NaCI+H2O n(HCI)=30*0.3/36.5=0.25 моль
40 18 n(NaOH)=30*0.3/40=0.225моль
m(H2O)= (30*0.3)*18/40=4.05г
n(H2O)= 4.05/18=0.225 N=Nₐ *n =6.02*10²³ *0.225=1.354 *10²³
Ag + 2HNO3 = AgNO3 + NO2 + H2O
4Zn + 2NO2 =4 ZnO + N2
ZnO + 2KOH + H2O = K2[Zn(OH)4]
K2[Zn(OH)4] + 3 H2S = 2 <span>KHS + </span>ZnS + 4 H2O
2H₂ + O₂ = 2H₂O
n(H₂)=V÷22,4=11,2÷22,4=0,5моль
n(H₂O)=n(H₂)
m(H₂O)=18×0,5=9г