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a, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,2 0,2 0,2
b, \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
d,
PTHH: H2 + CuO → Cu + H2O
Mol: 0,2 0,2
\(m_{Cu}=0,2.64=12,8\left(g\right)\)
Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
____0,2_____0,4_____0,2____0,2 (mol)
a, \(V_{H_2}=0,2.24,79=4,958\left(l\right)\)
b, mZnCl2 = 0,2.136 = 27,2 (g)
c, Đề cho VTT > VLT nên bạn xem lại đề nhé.
a, Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
___0,1_________________0,1 (mol)
Ta có: \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Theo PT: \(n_{Fe}=\dfrac{2}{3}n_{H_2}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow m_{Fe}=\dfrac{1}{15}.56\approx3,73\left(g\right)\)
Bạn tham khảo nhé!
a) \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1-------------->0,1------>0,1
\(\Rightarrow m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
b) \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c) \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
0,1<---0,1
\(\Rightarrow m_{CuO}=0,1.80=8\left(g\right)\)
a: Zn+2HCl->ZnCl2+H2
0,2 0,4 0,2 0,2
mZnCl2=0,2*136=27,2(g)
b: V=0,2*22,4=4,48(lít)
a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b, \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Mg}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
c, \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta có: \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,2}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,2\left(mol\right)\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ a,PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{HCl}=2.0,2=0,4\left(mol\right);n_{H_2}=n_{Mg}=0,2\left(mol\right)\\ b,m_{HCl}=0,4.36,5=14,6\left(g\right)\\ c,n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\\ CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ Vì:\dfrac{0,2}{1}< \dfrac{0,3}{1}\Rightarrow CuOdư\\ n_{Cu}=n_{H_2}=0,2\left(mol\right)\\ m_{Cu}=0,2.64=12,8\left(g\right)\)
\(PTHH:Fe+2HCl->FeCl_2+H_2\)
0,15<--0,3<------0,15<-----0,15 (mol)
\(n_{H_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(m_{Fe}=n\cdot M=0,15\cdot56=8,4\left(g\right)\)
\(m_{FeCl_2}=n\cdot M=0,15\cdot\left(56+71\right)=19,05\left(g\right)\)
Fe+2HCl->FeCl2+H2
0,6--------------------0,6
H2+CuO-to>Cu+H2O
0,6--------------0,6
n Fe=0,6 mol
=>VH2=0,6.22,4=13,44l
=>m Cu=0,6.64=38,4g
\(n_{Fe}=\dfrac{33,6}{56}=0,6mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,6 1,2 0,6 0,6
\(V_{H_2}=0,6\cdot22,4=13,44l\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,6 0,6 0,6
\(m_{Cu}=0,6\cdot64=38,4g\)