a)
$NH_4Cl+ NaOH \to NH_3 + H_2O$
$n_{NH_3} = n_{NaOH} = \dfrac{200.10\%}{40} = 0,5(mol)$
$V_{NH_3} = 0,5.22,4 = 11,2(lít)$
b)
Sau phản ứng :
$m_{dd} = 200 + 100 - 0,5.17 = 291,5(gam)$
$n_{NaCl} = n_{NaOH} = 0,5(mol)$
$C\%_{NaCl} = \dfrac{0,5.58,5}{291,5}.100\% = 10,03\%$