M=M*n=170*100=17000г
Mr(AgNO3)=108+14+48=170
n=N/6.02*10^23=6.02*10^25/6.02*10^23=100 моль
Na₂⁺S²⁻ Cu⁺²O⁻² Si⁻⁴H₄⁺ C⁺⁴O₂⁻² Ba₃⁺²N₂⁻³ S⁺⁶O₃²⁻ P₂⁺⁵O₂⁻² P⁺³Cl₃⁻ C⁺⁴S₂²⁻ C⁺⁴Cl₄⁻ P⁺⁵Br₅⁻ S⁺⁶F₆⁻ I⁺⁷F₇⁻ O⁺²F₂⁻ Na⁺H⁻ H₂⁺O₂⁺
K₂⁺Cr₂⁺⁶O₇²⁻ Na₂⁺Mn⁺⁶O₄²⁻ Ca₃²⁺(P⁺⁵O₄²⁻)₂ Al₂⁺³(S⁺⁶O₄²⁻)³ K₂⁺Cr⁺⁶O₄²⁻ Na⁺Cl⁺O²⁻
C6H6+Br2=C6H5Br+HBr
C2H5NH2+HBr=[C2H5NH3]⁺Br⁻
n(C6H6)=15.5/78=0.2моль
n(HBr)=n(C6H6)
n(HBr)=0.2*0.7=0.14моль
n(HBr)=n(C2H5NH2)=0.14
m(C2H5NH2)=45*0.14=6.3г
w(C2H5NH2)=6.3/30*100%=21%