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\(n\)Fe = \(\dfrac{8,4}{56}\)= 0,15 mol
Fe + 2HCl -----> FeCl\(2\)+H\(2\)
0,15->0,3 ->0,15 -> 0,15 (mol
V\(H2\) = 0,15 . 22,4 = 3,36 l
b, mct HCl = 0,3 . 36,5 = 10,95 (g)
mdd HCl = \(\dfrac{10,95}{10,95\%}\) = 100 (g)
c, mdd sau pu = 8,4 + 100 - 0,15.2 = 108,1 g
C% FeCl2 = \(\dfrac{0,15.127}{108,1}.100\%\)= 1,76%
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)
\(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
PTHH :
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,15 0,3 0,15 0,15
\(V_{H_2}=n.22,4=0,15.22,4=3,36\left(l\right)\)
Còn lại đề thiếu dữ kiện , bạn bổ sung và nếu cần thì đăng lại nha
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
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) $2Al + 6HCl \to 2AlCl_3 + 3H_2$
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%
\(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\\ pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,4 0,8 0,4 0,4
\(a,V_{H_2}=0,4.22,4=8,96\left(l\right)\\ b,C\%_{HCl}=\dfrac{0,8.36,5}{150}.100\%=19,5\%\\ c,m_{\text{dd}}=26+150-\left(0,4.2\right)=175,2\left(g\right)\\ C\%_{ZnCl_2}=\dfrac{0,4.136}{175,2}.100\%=31\%\)
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
PTHH :
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,4 1,2 0,4 0,6
\(a,V_{H_2}=0,6.22,4=13,44\left(l\right)\)
\(b,m_{HCl}=1,2.36,5=43,8\left(g\right)\)
\(c,m_{AlCl_3}=133,5.0,4=53,4\left(g\right)\)
\(m_{ddHCl}=\dfrac{43,8.100}{10}=438\left(g\right)\)
\(m_{ddAlCl_3}=10,8+438-\left(0,6.2\right)=447,6\left(g\right)\)
\(C\%=\dfrac{53,8}{447,6}.100\%\approx12,02\%\)
a)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2-->0,4----->0,2--->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
b) mHCl = 0,4.36,5 = 14,6 (g)
=> \(m_{dd.HCl}=\dfrac{14,6.100}{7,3}=200\left(g\right)\)
c)
mdd sau pư = 13 + 200 - 0,2.2 = 212,6 (g)
mZnCl2 = 0,2.136 = 27,2 (g)
=> \(C\%=\dfrac{27,2}{212,6}.100\%=12,8\%\)
\(n_{Al}=\dfrac{6,75}{27}=0,25\left(mol\right)\)
PTHH :
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,25 0,75 0,25 0,375
\(a,V_{H_2}=0,375.22,4=8,4\left(l\right)\)
\(b,m_{HCl}=0,75.36,5=27,375\left(g\right)\)
\(m_{ddHCl}=\dfrac{27,375.100}{10,95}=250\left(g\right)\)
\(c,m_{AlCl_3}=0,25.133,5=33,375\left(g\right)\)
\(m_{ddAlCl_3}=6,75+250-\left(0,375.2\right)=256\left(g\right)\)
\(C\%_{AlCl_3}=\dfrac{33,375}{256}.100\%\approx13,04\left(\%\right)\)