\(m_{NaCl\left(bd\right)}=\dfrac{1.89,5.10^6}{100}=895000\left(g\right)\)
\(m_{ddHCl}=1250.10^3.1,19=1487500\left(g\right)\)
=> \(n_{HCl}=\dfrac{1487500.37\%}{36,5}=\dfrac{550375}{36,5}\left(mol\right)\)
=> \(n_{NaCl\left(pư\right)}=\dfrac{550375}{36,5}\left(mol\right)\)
=> \(H\%=\dfrac{\dfrac{550375}{36,5}.58,5}{895000}.100\%=98,56\%\)
Một tấn muối ăn chứa 10,5% tạp chất.
\(\Rightarrow\)Nó chứa 89,5% muối nguyên chất.
\(\Rightarrow m_{NaCl}=1\cdot89,5\%=0,895tấn\)
\(m_{ddHCl}=D\cdot V=1,19\cdot1250\cdot1000=1487500g\)
\(\Rightarrow m_{HCl}=\dfrac{1487500\cdot37\%}{100\%}=550375g\)
\(\Rightarrow n_{HCl}=15078,76712mol\)
\(n_{NaCl}=\dfrac{0,895\cdot10^6}{23+35,5}=15299,1453mol\)
\(H=\dfrac{n_{HCl}}{n_{NaCl}}=\dfrac{15078,76712}{15299,1453}=98,56\%\)