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250ml=0,25l
\(MgO+2HCl\rightarrow MgCl_2+H_2O\)
0.2.........0.4..........0,2............0,2 (mol)
a)
\(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)
\(m_{MgCl_2}=0,2.95=19\left(g\right)\)
b)
\(C_{M_{HCl}}=\dfrac{0,4}{0,25}=1,6\left(M\right)\)
a/ \(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)
PTHH: MgO + 2HCl → MgCl2 + H2O
Mol: 0,2 0,4 0,2
\(m_{MgCl_2}=0,2.95=19\left(g\right)\)
b/ \(C_{M_{ddHCl}}=\dfrac{0,4}{0,25}=1,6M\)
Bài 9 :
\(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
0,05--->0,1-------->0,05
a) \(C_{MddHCl}=\dfrac{0,1}{0,1}=1\left(M\right)\)
b) \(m_{CuCl2}=0,05.135=6,75\left(g\right)\)
c) \(C_{MCuCl2}=\dfrac{0,05}{0,1}0,5\left(M\right)\)
Câu 10 :
\(n_{FeO}=\dfrac{3,6}{72}=0,05\left(mol\right)\)
\(FeO+2HCl\rightarrow FeCl_2+H_2O\)
0,05-->0,1------->0,05
\(m_{ddHCl}=\dfrac{0,1.36,5}{10\%}100\%=36,5\left(g\right)\)
\(m_{ddspu}=3,6+36,5=40,1\left(g\right)\)
\(C\%_{FeCl2}=\dfrac{0,05.127}{40,1}.100\%=15,84\%\)
Bài 2 :
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH :
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
0,1 0,3 0,1 0,3
\(m_{Fe_2\left(SO_4\right)_3}=0,1.400=40\left(g\right)\)
\(b,V_{ddH_2SO_4}=\dfrac{0,3}{2}=0,15\left(l\right)\)
\(c,C_{M\left(Fe_2\left(SO_4\right)_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}\left(M\right)\)
Bài 3 :
\(n_{Mg}=\dfrac{4.8}{24}=0,2\left(mol\right)\)
PTHH :
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2O\)
0,2 0,2 0,2 0,2
\(m_{MgSO_4}=0,2.120=24\left(g\right)\)
\(V_{H_2}=0,2.24,79=4,958\left(l\right)\)
\(c,C_{M\left(H_2SO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(d,C_{M\left(MgSO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Bài 4 :
\(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
PTHH :
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
0,3 0,45 0,15 0,45
\(V_{H_2}=0,45.24,79=11,1555\left(l\right)\)
\(m_{H_2SO_4}=0,45.98=44,1\left(g\right)\)
\(C\%_{H_2SO_4}=\dfrac{44,1}{300}.100\%=14,7\%\)
\(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\)
\(m_{dd}=8,1+300-\left(0,45.2\right)=307,2\left(g\right)\)
\(C\%_{Al_2\left(SO_4\right)_3}=\dfrac{51,3}{307,2}.100\%\approx16,7\%\)
Bài 5 :
\(n_{H_2}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)
PTHH:
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,2 0,4 0,2 0,2
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
\(C_{M\left(HCl\right)}=\dfrac{0,4}{0,2}=2\left(M\right)\)
\(C_{M\left(FeCl_2\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ \Rightarrow n_{Zn}=n_{H_2}=\dfrac{3,7185}{24,79}=0.,15(mol)\\ \Rightarrow m_{Zn}=0,15.65=9,75(g)\\ \Rightarrow \%_{Zn}=\dfrac{9,75}{10}.100\%=97,5\%\\ \Rightarrow \%_{Cu}=100\%-97,5\%=2,5\%\\ b,n_{HCl}=2n_{H_2}=0,3(mol)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{0,3.36,5}{14\%}=78,21(g)\)
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
a) Pt : \(CuO+2HCl\rightarrow CuCl_2+H_2O|\)
1 2 1 1
0,1 0,2 0,1
Hiện tượng : CuO tan dần , tạo ra dung dịch có màu xanh lam
b) \(n_{CuCl2}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
⇒ \(m_{CuCl2}=0,1.135=13,5\left(g\right)\)
c) \(n_{HCl}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)
\(V_{ddHCl}=\dfrac{0,2}{0,5}=0,4\left(l\right)\)
Chúc bạn học tốt
a,Hiện tượng: Sau phản ứng tạo thành dd màu xanh lam và có khi ko màu thoát ra
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PTHH: CuO + 2HCl → CuCl2 + H2O
Mol: 0,1 0,2 0,1
b, \(m_{CuCl_2}=0,1.135=13,5\left(g\right)\)
c, \(V_{ddHCl}=\dfrac{0,2}{0,5}=0,4\left(l\right)\)
Ta có: \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PT: \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
a, Theo PT: \(n_{CuCl_2}=n_{CuO}=0,1\left(mol\right)\Rightarrow m_{CuCl_2}=0,1.135=13,5\left(g\right)\)
b, \(n_{HCl}=2n_{CuO}=0,2\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
a)
$n_{MgO} = \dfrac{8}{40} = 0,2(mol)$
$MgO + 2HCl \to MgCl_2 + H_2O$
$n_{MgCl_2} = n_{MgO} = 0,2(mol) \Rightarrow m_{MgCl_2} = 0,2.95 = 19(gam)$
b)
$n_{HCl} =2 n_{MgO} = 0,2.2 = 0,4(mol) \Rightarrow m_{dd\ HCl} = \dfrac{0,4.36,5}{4\%} = 365(gam)$
a) MgO + 2HCl→ MgCl2+ H2O
(mol) 0,2 0,4 0,2
\(n_{MgO}=\dfrac{m}{M}=\dfrac{8}{40}=0,2\left(mol\right)\)
→\(m_{MgCl_2}=n.M=0,2.95=19\left(g\right)\)
b) Ta có:
\(4\%=\dfrac{m_{HCl_{ }}}{m_{ddHCl}}.100\%< =>4\%=\dfrac{0,4.36,5}{m_{ddHCl}}.100\%\)
=> mdd HCl=\(\dfrac{14,6.100}{4}=365\left(g\right)\)
Vạy khối lượng dung dịch HCl cần dùng cho phản ứng là: 365g