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\(n_{H_2}=\dfrac{2,24}{22,4}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 ( mol )
\(m_{Zn}=0,1.65=6,5g\)
\(C_{MddHCl}=\dfrac{0,2}{0,4}=0,5M\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{Zn}=0,1.65=6,5\left(g\right)=a\)
b, \(n_{HCl}=2n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)
c, \(n_{ZnCl_2}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow C_{M_{ZnCl_2}}=\dfrac{0,1}{0,4}=0,25\left(M\right)\)
a) nH2=V/22,4=2,24/22,4=0,1(mol)
VHCl=400ml=0,4 (lit)
PT
Zn + 2HCl -> ZnCl2 + H2
1.............2............1...........1 (mol)
0,1 < - 0,2 <- 0,1 <- 0,1 (mol)
=> a (g) = mZn=n.M=0,1.65=6,5 (g)
c) \(C_{M_{HCl}}=\dfrac{n}{V}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)
Theo gt ta có: $n_{Al}=0,1(mol)$
a, $2Al+6HCl\rightarrow 2AlCl_3+3H_2$
b, $\Rightarrow n_{H_2}=0,15(mol)\Rightarrow V_{H_2}=3,36(l)$
c, Ta có: $n_{HCl}=0,3(mol)\Rightarrow m_{HCl}=10,95(g)\Rightarrow \%m_{ddHCl}=219(g)$
d, Bảo toàn khối lượng ta có: $m_{dd}=221,4(g)$
$\Rightarrow \%C_{AlCl_3}=6,02\%$
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(n_{H_2}=\dfrac{0,896}{22,4}=0,04\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,04\left(mol\right)\Rightarrow m_1=m_{Zn}=0,04.65=2,6\left(g\right)\)
\(n_{HCl}=2n_{H_2}=0,08\left(mol\right)\Rightarrow m_{HCl}=0,08.36,5=2,92\left(g\right)\)
\(\Rightarrow m_2=m_{ddHCl}=\dfrac{2,92}{14,6\%}=20\left(g\right)\)
b, Ta có: m dd sau pư = mZn + m dd HCl - mH2 = 22,52 (g)
\(n_{ZnCl_2}=n_{H_2}=0,04\left(mol\right)\)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{0,04.136}{22,52}.100\%\approx24,16\%\)
nAl=0,2(mol)
mHCl=500.10%=50(g) => nHCl=50/36,5=100/73(mol)
PTHH: 2 Al + 6 HCl -> 2 AlCl3 + 3 H2
Vì: 0,2/2 < 100/73:6
=> Al hết, HCl dư, tính theo nAl
a) nH2=3/2. 0,2=0,3(mol) => V(H2,đktc)=0,3.22,4=6,72(l)
b) mHCl(tham gia p.ứ)= 6/2. 0,2 . 36,5= 21,9(g)
c) mddsau= 5,4+500-0,3.2=504,8(g)
mAlCl3=0,2. 133,5= 26,7(g)
mHCl(DƯ)= 50 -21,9=28,1(g)
C%ddAlCl3= (26,7/504,8).100=5,289%
C%ddHCl(dư)= (28,1/504,8).100=5,567%
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{ZnCl_2}=n_{Zn}=n_{H_2}=0,15\left(mol\right);n_{HCl}=2.0,15=0,3\left(mol\right)\\ a,m=m_{Zn}=0,15.65=9,75\left(g\right)\\ b,C_{MddHCl}=\dfrac{0,3}{0,15}=0,2\left(l\right)\\ c,m_{ZnCl_2}=0,15.136=20,4\left(g\right)\)
a) Zn + 2HCl --> ZnCl2 + H2
b) nH2=2,24/22,4=0,1 mol
=> nZn=nH2=0,1
=>mZn =0,1 . 65=6,5
=> a=6,5
c) nHCl= 2 nH2 =2.0,1 =0,2 mol
CM=n/V=0,2/0,4=0,5
nH2 = 2,24 / 22,4 = 0,1 mol
Zn + 2HCL--------- ZnCL2 + H2
pt: 1mol 1mol
đb: ? ? 0.1 mol
theo pt nZn = nH2= 0,1 mol=) mZn = 0,1. 65= 6,5 (g)
vậy khối lượng a = 6.5 g
theo pt : nHCL= 2nH2= 2.0,1= 0,2 mol =) nHCL= 0,2 mol
400ml= 0.4l
adct: Cm= n/V =0,2/0,4=0.5( mol/l)
vậy nồng độ mol của HCL có trong dd là: 0,5 mol