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a, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
b, \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,45\left(mol\right)\Rightarrow V_{H_2}=0,45.22,4=10,08\left(l\right)\)
c, Ta có: m dd sau pư = 8,1 + 200 - 0,45.2 = 207,2 (g)
Theo PT: \(n_{AlCl_3}=n_{Al}=0,3\left(mol\right)\)
\(\Rightarrow C\%_{AlCl_3}=\dfrac{0,3.133,5}{207,2}.100\%\approx19,33\%\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{10,95\%}=\dfrac{400}{3}\left(g\right)\)
d, \(n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\)
Ta có: m dd sau pư = 13 + 400/3 - 0,2.2 = 2189/15 (g)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{0,2.136}{\dfrac{2189}{15}}.100\%\approx18,64\%\)
a.
PTHH:
Zn + 2HCl ---> ZnCl2 + H2
0.2 0.4 0.2 0.2 (mol)
b.
nZn=13/65=0.2(mol)
V H2 = 0.2*22.4 = 4.48 (l)
c.
mHCl=0.4*36.5=14.6(g)
mddHCl=14.6/10.95*100~133(g)
d.
mZn=0.2*35.5=7.1(g)
mZnCl2=0.2*106=21.2(g)
mH2=0.2*2=0.4(g)
Theo ĐLBTKL, ta có:
mZn + mddHCl = mddZnCl2 + mH2
7.1 + 133 = mddZnCl2 + 4
=> mddZnCl2= 7.1 + 133 - 4 = 136.1 (g)
S ZnCl2= 21.2/136.1*100 ~ 15 (g)
\(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\\ pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,4 0,8 0,4 0,4
\(a,V_{H_2}=0,4.22,4=8,96\left(l\right)\\ b,C\%_{HCl}=\dfrac{0,8.36,5}{150}.100\%=19,5\%\\ c,m_{\text{dd}}=26+150-\left(0,4.2\right)=175,2\left(g\right)\\ C\%_{ZnCl_2}=\dfrac{0,4.136}{175,2}.100\%=31\%\)
a) $2Al + 6HCl \to 2AlCl_3 + 3H_2$
b) n Al = 8,1/27 = 0,3(mol)
Theo PTHH :
n H2 = 3/2 n Al = 0,45(mol)
V H2 = 0,45.22,4 = 10,08(lít)
c) n AlCl3 = n Al = 0,3(mol)
m AlCl3 = 0,3.133,5 = 40,05(gam)
d) n HCl = 3n Al = 0,9(mol)
m dd HCl = 0,9.36,5/7,3% = 450(gam)
Sau phản ứng :
m dd = 8,1 + 450 -0,45.2 = 457,2(gam)
C% AlCl3 = 40,05/457,2 .100% = 8,76%
\(n_{Al}=\dfrac{6,75}{27}=0,25\left(mol\right)\)
PTHH :
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,25 0,75 0,25 0,375
\(a,V_{H_2}=0,375.22,4=8,4\left(l\right)\)
\(b,m_{HCl}=0,75.36,5=27,375\left(g\right)\)
\(m_{ddHCl}=\dfrac{27,375.100}{10,95}=250\left(g\right)\)
\(c,m_{AlCl_3}=0,25.133,5=33,375\left(g\right)\)
\(m_{ddAlCl_3}=6,75+250-\left(0,375.2\right)=256\left(g\right)\)
\(C\%_{AlCl_3}=\dfrac{33,375}{256}.100\%\approx13,04\left(\%\right)\)
Mg + 2HCl → MgCl2 + H2
nMg = 7,2:24 = 0,3 mol
Theo tỉ lệ phương trình phản ứng => nH2 = nMg = 0,3 mol
<=> VH2 đktc = 0,3.22,4 = 6,72 lít
\(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
PTHH:
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,15 0,3 0,15
\(a,V_{H_2}=0,15.22,4=3,36\left(l\right)\)
\(b,C_{M_{HCl}}=\dfrac{n}{V}=\dfrac{0,3}{0,1}=3M\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
d, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3\%}=200\left(g\right)\)
⇒ m dd sau pư = 13 + 200 - 0,2.2 = 212,6 (g)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{27,2}{212,6}.100\%\approx12,79\%\)
Số mol của khí hidro
nH2 = \(\dfrac{V_{H2}}{22,4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
a) Pt: Zn + 2HCl → ZnCl2 + H2\(|\)
1 2 1 1
0,25 0,5 0,25
b) Số mol của kẽm
nZn = \(\dfrac{0,25.1}{1}=0,25\left(mol\right)\)
Khối lượng của kẽm
mZn = nZn . MZn
= 0,25 . 65
= 16,25 (g)
c) Số mol của dung dịch axit clohidric
nHCl = \(\dfrac{0,25.2}{1}=0,5\left(mol\right)\)
Thể tích của dung dịch axit clohidric cần dùng
CMHCl = \(\dfrac{n}{V}\Rightarrow V\dfrac{n}{C_M}=\dfrac{0,5}{0,5}=1\left(l\right)\)
Chúc bạn học tốt
\(n_{Fe}=\dfrac{8,4}{56}=0,15mol\)
a)\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,15 0,3 0,15 0,15
\(V_{H_2}=0,15\cdot22,4=3,36l\)
b)\(m_{H_2}=0,15\cdot2=0,3g\)
\(BTKL:m_{ddFeCl_2}=8,4+100-0,3=108,1g\)
\(m_{ctFeCl_2}=0,15\cdot127=19,05g\)
\(C\%=\dfrac{m_{ctFeCl_2}}{m_{ddFeCl_2}}\cdot100\%=\dfrac{19,05}{108,1}\cdot100\%=17,62\%\)