Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) \(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PTHH: `Fe + 2HCl -> FeCl_2 + H_2`
0,05->0,1----->0,05---->0,05
`=> V_{ddHCl} = (0,1)/2 = 0,05 (l)`
b) `V_{H_2} = 0,05.22,4 = 1,12 (l)`
c) `C_{M(FeCl_2)} = (0,05)/(0,05) = 1M`
Câu 1
\(a)PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\
b)200ml=0,2l\\
n_{HCl}=0,2.1=0,2mol\\
n_{H_2}=n_{MgCl_2}=\dfrac{1}{2}n_{H_2}=\dfrac{1}{2}\cdot0,2=0,1mol\\
V_{H_2}=0,1.24,79=2,479l\\
c)C_{M_{MgCl_2}}=\dfrac{0,1}{0,2}=0,5M\)
\(a) n_{Fe_2O_3}= \dfrac{8}{160} = 0,05(mol)\\ Fe_2O_3 + 6HCl \to 2FeCl_3 + 3H_2O\\ n_{FeCl_3} = 2n_{Fe_2O_3} = 0,1(mol)\\ m_{FeCl_3} = 0,1.162,5 = 16,25(gam)\\ b) n_{HCl} = 6n_{Fe_2O_3} = 0,05.6 = 0,3(mol)\\ V_{dd\ HCl} = \dfrac{0,3}{0,5} = 0,6(lít)\\ c) V_{dd\ sau\ pư} = V_{dd\ HCl} =0,6(lít)\\ C_{M_{FeCl_3}} = \dfrac{0,1}{0,6} = 0,167M\)
PTHH:\(Fe_2O_3+HCl\rightarrow FeCl_3+3H_2O\)
\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)
a, Bảo toàn nguyên tố Fe:
\(n_{FeCl_3}=n_{Fe}=2n_{Fe_2O_3}=2.0,05=0,1\left(mol\right)\)
\(\Rightarrow m_{FeCl_3}=162,5.0,1=16,25\left(g\right)\)
b, Bảo toàn nguyên tố Cl:
\(n_{Hcl}=n_{Cl}=3n_{FeCl_3}=3.0,1=0,3\left(mol\right)\)
\(\Rightarrow V_{ddHCl}=\dfrac{n_{HCL}}{C_M}=\dfrac{0,3}{0,5}=0,6\left(l\right)\)
c,\(C_{M_{FeCl_3}}=\dfrac{n_{FeCl_3}}{V_{ddFeCl_3}}=\dfrac{0,1}{0,6}=0,17M\)
PT: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
a, Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,2}{1}\). ta được H2SO4 dư.
Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{ZnSO_4}=n_{Zn}=0,1\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4\left(dư\right)}=0,2-0,1=0,1\left(mol\right)\)
b, Ta có: \(m_{ZnSO_4}=0,1.161=16,1\left(g\right)\)
c, \(C_{M_{H_2SO_4\left(dư\right)}}=\dfrac{0,1}{0,2}=0,5M\)
\(C_{M_{ZnSO_4}}=\dfrac{0,1}{0,2}=0,5M\)
Bạn tham khảo nhé!
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{ZnCl_2}=n_{Zn}=n_{H_2}=0,15\left(mol\right);n_{HCl}=2.0,15=0,3\left(mol\right)\\ a,m=m_{Zn}=0,15.65=9,75\left(g\right)\\ b,C_{MddHCl}=\dfrac{0,3}{0,15}=0,2\left(l\right)\\ c,m_{ZnCl_2}=0,15.136=20,4\left(g\right)\)
