a, \(n_{H2S}=0,1\left(mol\right)\)
\(n_{NaOH}=0,1.2=0,2\left(mol\right)\)
\(\frac{n_{NaOH}}{n_{H2S}}=2\)
\(2NaOH+H_2S\rightarrow Na_2S+2H_2O\)
\(n_{Na2S}=n_{H2S}=0,1\left(mol\right)\)
\(\Rightarrow m_{Na2S}=7,8\left(g\right)\)
b, \(n_{KOH}=0,1\left(mol\right)\)
\(\frac{n_{KOH}}{n_{H2S}}=1\)
\(KOH+H_2S\rightarrow KHS+H_2O\)
\(\Rightarrow n_{KHS}=n_{H2S}=0,1\left(mol\right)\)
\(\Rightarrow m_{KHS}=7,2\left(g\right)\)
c, \(n_{NaOH}=0,12\left(mol\right)\)
\(\frac{n_{NaOH}}{n_{H2S}}=1,2\)
\(2NaOH+H_2S\rightarrow Na_2S+2H_2O\)
\(NaOH+H_2S\rightarrow NaHS+H_2O\)
\(\Rightarrow\left\{{}\begin{matrix}2a+b=0,12\\a+b=0,1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a=0,02\\b=0,08\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Na2S}=0,02.78=1,56\left(g\right)\\m_{NaHS}=0,08.56=4,48\left(g\right)\end{matrix}\right.\)