\(n_{ZnO}=\dfrac{1,62}{81}=0,02\left(mol\right)\)
\(m_{HCl}=109,5.10\%=10,95\left(g\right)\Rightarrow n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\)
PTHH: ZnO + 2HCl → ZnCl2 + H2O
Mol: 0,02 0,3 0,02
Ta có: \(\dfrac{0,02}{1}< \dfrac{0,3}{1}\) ⇒ ZnO hết, HCl dư
mdd sau pứ = 1,62+109,5 = 111,12 (g)
\(C\%_{ddZnCl_2}=\dfrac{0,02.136.100\%}{111,12}=2,45\%\)
\(C\%_{ddHCl}=\dfrac{\left(0,3-0,04\right).36,5.100\%}{111,12}=8,54\%\)
\(n_{ZnO}=\dfrac{1,62}{81}=0,02\left(mol\right)\)
\(m_{HCl}=109,5.10\%=10,95\left(g\right)\Rightarrow n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\)
PTHH: ZnO + 2HCl → ZnCl2 + H2
Mol: 0,02 0,04 0,02 0,02
Ta có: \(\dfrac{0,02}{1}< \dfrac{0,3}{2}\) ⇒ ZnO hết, HCl dư
mdd sau pứ = 1,62+109,5-0,02.2 = 111,08 (g)
\(C\%_{ZnCl_2}=\dfrac{0,02.136.100\%}{111,08}=2,45\%\)
\(C\%_{HCldư}=\dfrac{\left(0,3-0,04\right).36,5.100\%}{111,08}=8,54\%\)