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Phản ứng thuộc phản ứng oxh- khử
VHCl= 400ml => VHCl= 0,4 lít
mZn= 1.3g => nZn= mZn/MZn = 1.3/65 = 0.02(mol)
Zn + 2HCl ---> ZnCl2 + H2
1 2 1 1
mol: 0.02 0.04 0.02 0.02
a) mZnCl2 = nZnCl2 . MZnCl2 = (0.02)( 65+ 35,5.2) =2,72g
b) VH2= nH2. 22,4 = 0.02 . 22.4 = 0.448(lít)
c) CM(HCl)= nHCl/VHCl = 0.04/0.4 = 0,1 M
nZn = 0,2 (mol)
nHCl = 0,5 (mol)
Zn + 2HCl \(\rightarrow\) ZnCl2 + H2
bđ 0,2 0,5 (mol)
pư 0,2 \(\rightarrow\) 0,4 \(\rightarrow\) 0,2 -----> 0,2 (mol)
spư 0 .......0,1.....0,2...........0,2 (mol)
a) mZnCl2 = 27,2 (g)
b)VH2=4,48 (l)
c) NaOH + HCl \(\rightarrow\) NaCl + H2O
0,1 <--- 0,1 (mol)
VNaOH = \(\frac{0,1}{0,5}\) = 0,2 (l) = 200 ml
\(n_{Zn}=\dfrac{9,75}{65}=0,15mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,15 0,3 0,15 0,15
\(m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\)
\(V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\)
\(C_{M_{HCl}}=\dfrac{0,3}{0,1}=3M\)
đổi 500ml = 0,5l
n(CH\(_3\)COOH)\(_2\)Mg= \(\dfrac{14,2}{142}\)= 0,1mol
2CH3COOH + Mg \(\rightarrow\) (CH3COO)2Mg + H2
0,2mol 0,1mol 0,1mol
a/ CCH3COOH= \(\dfrac{0,2}{0,5}\)=0,4M
b/ VH\(_2\) 0,1 . 22,4 = 2,24l
c/ nCH\(_3\)COOH= 0,2mol
CH3COOH + NaOH \(\rightarrow\) CH3COONa + H2
0,2mol 0,2mol
V\(_{dd_{NaOH}}\)= \(\dfrac{0,2}{0,5}\)= 0,4l
\(pt:zn+2HCl\rightarrow ZnCl_2+H_2\)
a,theo đề bài ta có : \(n_{zn}=\frac{13}{65}=0.2\left(mol\right),n_{hcl}=1.0,5=0,5\left(mol\right)\)
ta thấy hcl dư vì: \(\frac{n_{hcl}}{2}>\frac{n_{zn}}{1}\)
theo phương trình \(n_{zncl_2}=n_{zn}=0,2\left(mol\right)\Rightarrow m_{zncl_2}=0,2.127=25,4\left(mol\right)\)
b,\(n_{h_2}=n_{zn}=0,2\left(mol\right)\Rightarrow V_{hcl}=0,2.22,4=4,48\left(l\right)\)
c,theo phương trình \(n_{hcl_{pu}}=2n_{zn}=0,4\left(mol\right)\Rightarrow n_{hcl_{du}}=n_{hcl_{bandau}}-n_{pu}=0,5-0,4=0.1\left(mol\right)\)
\(pt:NaOH+HCl\rightarrow NaCl+H_2\)
\(\Rightarrow n_{NaOH}=n_{hcl}=0.1\Rightarrow V_{dd}=\frac{0.1}{0.5}=0.2\left(l\right)\)
2CH3COOH+Mg->(CH3COO)2Mg+H2
0,02---------------0,01-------0,01----------0,01
n muối=0,01mol
=>CM=\(\dfrac{0,02}{0,04}=0,5M\)
=>VH2=0,01.22,4=0,224l
CH3COOH+NaOH->CH3COONa+H2O
0,02--------------0,02
=>VNaOH=\(\dfrac{0,02}{0,75}=0,03l\)
a) \(n_{\left(CH_3COO\right)_2Mg}=\dfrac{1,42}{142}=0,01\left(mol\right)\)
PTHH: Mg + 2CH3COOH --> (CH3COO)2Mg + H2
0,01<-------0,02<------------0,01------->0,01
=> \(C_{M\left(dd.CH_3COOH\right)}=\dfrac{0,02}{0,04}=0,5M\)
b) VH2 = 0,01.22,4 = 0,224 (l)
c)
PTHH: NaOH + CH3COOH --> CH3COONa + H2O
0,02<------0,02
=> \(V_{dd.NaOH}=\dfrac{0,02}{0,75}=\dfrac{2}{75}\left(l\right)=\dfrac{80}{3}\left(ml\right)\)
a, \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 015 0,3 0,15 0,15
b, \(m_{Fe}=0,15.56=8,4\left(g\right)\)
\(m_{FeCl_2}=0,15.127=19,05\left(g\right)\)
c, \(C_{M_{ddHCl}}=\dfrac{0,3}{0,05}=6M\)
a) PTHH: Zn + H2SO4 -> ZnSO4 + H2
nH2= 0,15(mol)
=> nZn=nH2SO4=nZnSO4=nH2=0,15(mol)
b) mZn=0,15.65=9,75(g)
c) CMddH2SO4= 0,15/ 0,05=3(M)
d) mZnSO4= 161. 0,15=24,15(g)
200ml = 0,2l
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,3 0,6 0,3 0,3
a) \(n_{ZnCl2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
\(C_{M_{ZnCl2}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)
b) \(n_{H2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,3.22,4=6,72\left(l\right)\)
c) Pt : \(NaOH+HCl\rightarrow NaCl+H_2O|\)
1 1 1 1
0,6 0,6
\(n_{NaOH}=\dfrac{0,6.1}{1}=0,6\left(mol\right)\)
\(m_{NaOH}=0,6.40=24\left(g\right)\)
\(m_{ddNaOH}=\dfrac{24.100}{20}=120\left(g\right)\)
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