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\(n_{H_2}=\dfrac{0.56}{22.4}=0.025\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(n_{Al}=\dfrac{2}{3}\cdot0.025=\dfrac{1}{60}\left(mol\right)\)
\(m_{Al}=\dfrac{1}{60}\cdot27=0.45\left(g\right)\)
\(m_{Cu}=25-0.45=24.55\left(g\right)\)
\(\%Cu=\dfrac{24.55}{25}\cdot100\%=98.2\%\)
\(\%Al=100-98.2=1.8\%\)
\(Cu+2H_2SO_{4\left(đ\right)}\rightarrow CuSO_4+SO_2+2H_2O\)
\(2Al+6H_2SO_{4\left(đ\right)}\rightarrow Al_2\left(SO_4\right)_3+3SO_2+6H_2O\)
\(n_{Cu}=\dfrac{24.55}{64}=\dfrac{491}{1280}\left(mol\right)\)
\(V_{SO_2}=\left(\dfrac{1}{60}\cdot\dfrac{3}{2}+\dfrac{491}{1280}\right)\cdot22.4=9.1525\left(l\right)\)
a)
$2Al + 6HCl \to 2AlCl_3 + 3H_2$
b)
$n_{H_2} = \dfrac{0,56}{22,4} = 0,225(mol)$
Theo PTHH : $n_{Al} = \dfrac{2}{3}n_{H_2} = \dfrac{1}{60}(mol)$
$m_{Al} = \dfrac{1}{60}.27 = 0,45(gam)$
$m_{Cu} = 25 - 0,45 = 24,55(gam)$
c)
$\%m_{Al} = \dfrac{0,45}{25}.100\% = 1,8\%$
$\%m_{Cu} = 100\% -1,8\% = 98,2\%$
d)
$Cu + 2H_2SO_4 \to CuSO_4 + SO_2 + 2H_2O$
$2Al + 6H_2SO_4 \to Al_2(SO_4)_3 + 3SO_2 + 6H_2O$
Theo PTHH :
$n_{SO_2} = n_{Cu} + \dfrac{3}{2}n_{Al} = \dfrac{24,55}{64} + \dfrac{1}{60}.\dfrac{3}{2} = 0,41(mol)$
$V_{SO_2} = 0,41.22,4 = 9,184(lít)$
a) \(n_{H_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
PTHH: 2Al + 6HCl → 2AlCl3 + 3H2
Mol: x 1,5x
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: y y
Ta có: \(\left\{{}\begin{matrix}27x+65y=24,9\\1,5x+y=0,6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}27x+65.\left(0,6-1,5x\right)=24,9\\y=0,6-1,5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,3\end{matrix}\right.\)
b, \(m_{Al}=0,2.27=5,4\left(g\right);m_{Zn}=24,9-5,4=19,5\left(g\right)\)
c) \(\%m_{Al}=\dfrac{5,4.100\%}{24,9}=21,69\%;\%m_{Zn}=100\%-21,69\%=78,31\%\)
d)
PTHH: 2Al + 6HCl → 2AlCl3 + 3H2
Mol: 0,2 0,6 0,2 0,3
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,3 0,6 0,3 0,3
\(m_{ddHCl}=\dfrac{\left(0,6+0,6\right).36,5.100}{14}=312,857\left(g\right)\)
e) mdd sau pứ = 24,9 + 312,857 - (0,3+0,3).2 = 336,557 (g)
\(C\%_{ddAlCl_3}=\dfrac{0,2.133,5.100\%}{336,557}=7,93\%\)
\(C\%_{ddZnCl_2}=\dfrac{0,3.136.100\%}{336,557}=12,12\%\)
a) $Zn + 2HCl \to ZnCl_2 + H_2$
$ZnO + 2HCl \to ZnCl_2 + H_2O$
b)
Theo PTHH : $n_{Zn} = n_{H_2} = \dfrac{4,48}{22,4} = 0,2(mol)$
$m_{Zn} = 0,2.65 = 13(gam)$
$m_{ZnO} = 21,1 - 13 = 8,1(gam)$
c) $n_{ZnO} = 0,1(mol)$
Theo PTHH : $n_{HCl} = 2n_{Zn} + 2n_{ZnO} = 0,6(mol)$
$m_{dd\ HCl} = \dfrac{0,6.36,5}{16,6\%} = 132(gam)$
d) $m_{dd\ sau\ pư} = 21,1 + 132 - 0,2.2 = 152,7(gam)$
$n_{ZnCl_2} = n_{Zn} + n_{ZnO} = 0,3(mol)$
$C\%_{ZnCl_2} = \dfrac{0,3.136}{152,7}.100\% = 26,72\%$
Đặt: \(\left\{{}\begin{matrix}x=n_{Fe}\left(mol\right)\\y=n_{Al}\left(mol\right)\end{matrix}\right.\)
\(\sum m_{hh}=11\left(g\right)\Rightarrow56x+27y=11\left(1\right)\)
\(PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\\ \left(mol\right)....x\rightarrow..2x........x......x\\ PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\\ \left(mol\right)....y\rightarrow..3y.........y......1,5y\)
\(n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ \Rightarrow x+1,5y=0,4\left(2\right)\)
\(\xrightarrow[\left(2\right)]{\left(1\right)}\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)
a) \(\%m_{Fe}=\dfrac{56.0,1}{11}=51\%\)
\(\rightarrow\%m_{Al}=49\%\)
b) \(\sum m_{ctHCl}=\left(2.0,1+3.0,2\right).36,5=29,2\left(g\right)\)
\(m_{ddHCl}=\dfrac{29,2.100\%}{10\%}=292\left(g\right)\)
c) \(m_{H_2\uparrow}=\left(1.0,1+1,5.0,2\right).2=0,8\left(g\right)\)
\(m_{ddsaupu}=m_{hh}+m_{ddHCl}-m_{H_2\uparrow}=11+292-0,8=302,2\left(g\right)\)
\(C\%_{FeCl_2}=\dfrac{0,1.127}{302,2}.100=4,2\%\\ C\%_{AlCl_3}=\dfrac{0,2.133,5}{302,2}.100=8,8\%\)
Đặt: {x=nFe(mol)y=nAl(mol){x=nFe(mol)y=nAl(mol)
∑mhh=11(g)⇒56x+27y=11(1)∑mhh=11(g)⇒56x+27y=11(1)
PTHH:Fe+2HCl→FeCl2+H2↑(mol)....x→..2x........x......xPTHH:2Al+6HCl→2AlCl3+3H2↑(mol)....y→..3y.........y......1,5yPTHH:Fe+2HCl→FeCl2+H2↑(mol)....x→..2x........x......xPTHH:2Al+6HCl→2AlCl3+3H2↑(mol)....y→..3y.........y......1,5y
nH2=8,9622,4=0,4(mol)⇒x+1,5y=0,4(2)nH2=8,9622,4=0,4(mol)⇒x+1,5y=0,4(2)
(1)−→(2){x=0,1y=0,2→(2)(1){x=0,1y=0,2
a) %mFe=56.0,111=51%%mFe=56.0,111=51%
→%mAl=49%→%mAl=49%
b) ∑mctHCl=(2.0,1+3.0,2).36,5=29,2(g)∑mctHCl=(2.0,1+3.0,2).36,5=29,2(g)
mddHCl=29,2.100%10%=292(g)mddHCl=29,2.100%10%=292(g)
c) mH2↑=(1.0,1+1,5.0,2).2=0,8(g)mH2↑=(1.0,1+1,5.0,2).2=0,8(g)
mddsaupu=mhh+mddHCl−mH2↑=11+292−0,8=302,2(g)mddsaupu=mhh+mddHCl−mH2↑=11+292−0,8=302,2(g)
a) \(Fe+2HCL\rightarrow FeCl_2+H_2\uparrow\)
Cu không tác dụng được với HCL
a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b, Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,2.56=11,2\left(g\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{11,2}{20}.100\%=56\%\\\%m_{Cu}=100-56=44\%\end{matrix}\right.\)
c, Theo PT: \(n_{HCl}=2n_{H_2}=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(\Rightarrow C\%_{ddHCl}=\dfrac{14,6}{300}.100\%\approx4,87\%\)
Bạn tham khảo nhé!
Câu 29.
a)Dùng quỳ tím ẩm:
+Hóa xanh: \(NaOH;Ca\left(OH\right)_2\)
Nhỏ 1 lượng \(Na_2CO_3\) vào hai chất trên:
Xuất hiện kết tủa: \(Ca\left(OH\right)_2\)
\(Ca\left(OH\right)_2+Na_2CO_3\rightarrow CaCO_3\downarrow+2NaOH\)
Không hiện tượng:\(NaOH\)
+Qùy không đổi màu: \(NaCl;NaNO_3\)
Nhỏ 1 ít bạc nitrat \(AgNO_3\) xuất hiện kết tủa: \(NaCl\)
\(AgNO_3+NaCl\rightarrow AgCl\downarrow+NaNO_3\)
Không hiện tượng:\(NaNO_3\)
Câu 30.
\(n_{\uparrow}=\dfrac{1,12}{22,4}=0,05mol\)
a) \(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,05 0,1 0,05
\(m_{Zn}=0,05\cdot65=3,25\left(g\right)\)\(\Rightarrow\%m_{Zn}=\dfrac{3,25}{30}\cdot100\%=10,83\%\)
\(\Rightarrow m_{ZnO}=100\%-10,83\%=89,17\%\)
b)\(m_{ZnO}=30-3,25=26,75\left(g\right)\)
\(\Rightarrow n_{ZnO}=\dfrac{26,75}{81}=0,33mol\)
\(\Sigma n_{HCl}=0,33\cdot2+0,05\cdot2=0,76mol\)
\(\Rightarrow m_{HCl}=0,76\cdot36,5=27,74\left(g\right)\)
\(\Rightarrow m_{ddsau}=\dfrac{27,74}{7,4}\cdot100=374,86\left(g\right)\)
a) nH2=1,12/22,4=0,05(mol)
PTHH: Zn +2 HCl -> ZnCl2 + H2
0,05____0,1_____0,05____0,05(mol)
=>mZn= 0,05.65= 3,25(g)
b) => %mZn= (3,25/20).100=16,25%
=>%mZnO=100% - 16,25%= 83,75%
c) mZnO= 20 - 3,25= 16,75(g) => nZnO= 16,75/81= 67/324(mol)
PTHH: ZnO +2 HCl -> ZnCl2 + H2O
67/324______67/162(mol)
=> mddHCl= [(67/162+ 0,1). 36,5]: 14%=133,898(g)