Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{H_2}=\dfrac{0.84}{22.4}=0.0375\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(.........0.075......0.0375\)
\(m_{HCl}=0.075\cdot36.5=2.7375\left(g\right)\)
a) Fe + H2SO4 → FeSO4 + H2
b) Ta có : nH2 = \(\dfrac{16,8}{22,4}\) = 0,75 (mol)
⇒ nFe= 0,75.56 = 42(gam)
\(a,PTHH:Fe+H_2SO_4\to FeSO_4+H_2\\ b,n_{H_2}=\dfrac{16,8}{22,4}=0,74(mol)\\ \Rightarrow n_{Fe}=0,75(mol)\\ \Rightarrow m_{Fe}=0,75.56=42(g)\\ c,n_{H_2SO_4}=\dfrac{245.10\%}{100\%.98}=0,25(mol)\)
Vì \(\dfrac{n_{Fe}}{1}>\dfrac{n_{H_2SO_4}}{1}\) nên \(Fe\) dư
\(n_{Fe(dư)}=0,75-0,25=0,5(mol)\\ \Rightarrow m_{Fe(dư)}=0,5.56=28(g)\)
\(n_{BaCl_2}=\dfrac{208.10\%}{208}=0,1\left(mol\right)\\ a,BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\\ 0,1............0,1..............0,1.............0,2\left(mol\right)\\ b,m_{ddH_2SO_4}=\dfrac{0,1.98.100}{8}=122,5\left(g\right)\\ c,m_{kt}=m_{BaSO_4}=0,1.233=23,3\left(g\right)\\ d,m_{ddsau}=208+122,5-23,3=307,2\left(g\right)\\ C\%_{ddHCl}=\dfrac{0,2.36,5}{307,2}.100\approx2,376\%\)
\(Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2\)
b)
\(n_{H_2}= \dfrac{2,24}{22,4}= 0,1 mol\)
\(\)Theo PTHH:
\(n_{ZnSO_4}= n_{H_2}= 0,1 mol\)
\(m_{ZnSO_4}= 0,1 . 161=16,1g\)
c)
Theo PTHH:
\(n_{H_2SO_4}= n_{H_2}= 0,1 mol\)
\(\Rightarrow m_{H_2SO_4}= 0,1 . 98= 9,8g\)
\(\Rightarrow m_{dd H_2SO_4}= \dfrac{9,8 . 100}{20}=49g\)