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\(Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\\ n_{H_2}=n_{MgCl_2}=n_{Mg}=0,1\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ b,m_{MgCl_2}=95.0,1=9,5\left(g\right)\\ c,m_{ddMgCl_2}=m_{Mg}+m_{ddHCl}-m_{H_2}=2,4+200-0,1.2=202,2\left(g\right)\\ C\%_{ddMgCl_2}=\dfrac{9,5}{202,2}.100\approx4,698\%\\ d,n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\\ PTHH:H_2+CuO\rightarrow\left(t^o\right)Cu+H_2O\\ Vì:\dfrac{0,2}{1}>\dfrac{0,1}{1}\Rightarrow CuOdư\\ n_{CuO\left(dư\right)}=0,2-0,1.1=0,1\left(mol\right)\\ m_{CuO\left(dư\right)}=0,1.80=8\left(g\right)\)
a, \(n_{Fe}=\frac{0.56}{56}=0.01\left(mol\right)\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
0.01 0.01 0.01 0.01
\(V_{H_2}=0.01\times22.4=0.224\left(l\right)\)
b, \(m_{H_2SO_4}=0.01\times98=0.98\left(g\right)\)
\(m_{ddH_2SO_4}=\frac{100\times0.98}{19.6}=5\left(g\right)\)
\(m_{FeSO_4}=0.01\times152=1.52\left(g\right)\)
\(C\%_{FeSO_4}=\frac{1.52\times100}{5}=30.4\%\)
\(a,n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\\ PTHH:Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\left(1\right)\\ Theo.pt\left(1\right):n_{H_2}=n_{MgSO_4}=n_{Mg}=0,1\left(mol\right)\\ V_{H_2}=0,1.22,4=2,24\left(l\right)\\ m_{MgSO_4}=0,1.120=12\left(g\right)\\ b,PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\left(2\right)\\ Theo.pt\left(2\right):n_{Cu}=n_{H_2}=0,1\left(mol\right)\\ m_{Cu}=0,1.64=6,4\left(g\right)\)
nMg = 6/24 = 0,25 (mol)
PTHH: Mg + 2HCl -> MgCl2 + H2
nH2 = 0,25 (mol(
VH2 = 0,25 . 24,79 = 6,1975 (l)
CuO + H2 -> (t°) Cu + H2O
nCu = 0,25 (mol)
mCu = 0,25 . 64 = 16 (g)
\(n_{HCl}=0,2.2=0,4\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=n_{FeCl_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ a,m_{Fe}=0,2.56=11,2\left(g\right)\\ b,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,V_{ddFeCl_2}=V_{ddHCl}=0,2\left(l\right)\\ C_{MddFeCl_2}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,2 0,4 0,2 0,2
a) \(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
b) \(n_{ZnCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)
c) \(n_{HCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
⇒ \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(C_{ddHCl}=\dfrac{14,6.100}{250}=5,84\)0/0
Chúc bạn học tốt
a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, \(n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
c, m dd muối = 13,6 + 172,8 = 186,4 (g)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{13,6}{186,4}.100\%\approx7,3\%\)
\(pthh:Zn+2HCl--->ZnCl_2+H_2\uparrow\)
a. Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo pt: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(lít\right)\)
b. Theo pt: \(n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\)
\(\Rightarrow m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
c. \(C_{\%_{ZnCl_2}}=\dfrac{m_{ZnCl_2}}{m_{dd_{ZnCl_2}}}.100\%=\dfrac{13,6}{13,6+172,8}.100\%=7,3\%\)