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`n_[Zn]=13/65=0,2(mol)`
`Zn + 2HCl -> ZnCl_2 + H_2 \uparrow`
`0,2` `0,4` `0,2` `(mol)`
`a)V_[H_2]=0,2.22,4=4,48(l)`
`b)C%_[HCl]=[0,4.36,5]/150 .100~~9,73%`
1)
a) Fe + 2HCl --> FeCl2 + H2
b) \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
0,15->0,3--->0,15-->0,15
=> VH2 = 0,15.22,4 = 3,36 (l)
c) mdd sau pư = 8,4 + 250 - 0,15.2 = 258,1 (g)
=> \(C\%_{FeCl_2}=\dfrac{0,15.127}{258,1}.100\%=7,38\%\)
2)
a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2-->0,4---->0,2--->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
mZnCl2 = 0,2.136 = 27,2 (g)
c) \(C_{M\left(dd.HCl\right)}=\dfrac{0,4}{0,2}=2M\)
d)
PTHH: A + 2HCl --> ACl2 + H2
0,2<--0,4
=> \(M_A=\dfrac{4,8}{0,2}=24\left(g/mol\right)\)
=> A là Mg(Magie)
n Zn= 19,5/65=0,3 (mol).
PTPƯ: Zn(0.3) + HCl(0.6) ----> ZnCl2(0.3) + H2(0,3)
mHCl=0,6.36.5=21.9(g)
a) C%HCl= 21.9/300.100%=7,3%
b) VH2=0,3.22,4=6,72(lít)
c) mH2=0,3.2=0,6(g)
mZnCl2=0,3.136=40,8(g)
mddZnCl2 =(19,5+300)-0,6=318,9(g)
C%=mZnCl2/mddZnCl2.100= 40,8/318,9.100=12,793%
`a)PTHH:`
`Zn + 2HCl -> ZnCl_2 + H_2`
`0,02` `0,02` `0,02` `(mol)`
`n_[Zn]=[1,3]/65=0,02(mol)`
`b)V_[H_2]=0,02.22,4=0,448(l)`
`c)C%_[ZnCl_2]=[0,02.136]/[1,3+50-0,02.2].100~~5,31%`
\(n_{Zn}=\dfrac{1,3}{65}=0,02\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,02 0,04 0,02 0,02 ( mol )
\(V_{H_2}=0,02.22,4=0,448\left(l\right)\)
\(C\%_{ZnCl_2}=\dfrac{0,02.136}{1,3+50-0,02.2}.100=5,3\%\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ n_{HCl}=\dfrac{109,5.20\%}{36,5}=0,6\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ Vì:\dfrac{0,2}{1}< \dfrac{0,6}{2}\Rightarrow HCldư\\ n_{H_2}=n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\\ n_{HCl\left(dư\right)}=0,6-0,2.2=0,2\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ b,m_{ZnCl_2}=136.0,2=27,2\left(g\right)\\ c,m_{ddsau}=13+109,5-0,2.2=122,1\left(g\right)\\ C\%_{ddZnCl_2}=\dfrac{27,2}{122,1}.100\approx22,277\%\\ C\%_{ddHCl\left(dư\right)}=\dfrac{0,2.36,5}{122,1}.100\approx5,979\%\)
Zn + 2HCl -> ZnCl2 + H2
a, nZn = 13/65= 0,2(mol)
mHCl= 109,5.20%/100%=21.9(g)
nHCl=21,9/36,5=0,6(mol)
Theo PT nHCl = 2nZn= 2.0,2= 0,4(mol)<0,6(mol)
=> HCl pư dư, Zn pư hết
Theo PT: nH2= nZn =0,2(mol)
VH2=0,2.22,4=4,48(l)
b, Theo PT: nZnCl2=nZn=0,2(mol)
mZnCl2= 0,2.136=27,2(g)
c, mdd sau pư= 13+109,5-0,2.2=122,1(g)
C%dd ZnCl2=27,2.100%/122,1=22,28%
nHCl dư= 0,6-0,4=0,2(mol)
mHcl
`a)PTHH:`
`Zn + 2HCl -> ZnCl_2 + H_2`
`0,1` `0,2` `0,1` `0,1` `(mol)`
`n_[HCl]=0,2.1=0,2(mol)`
`=>m_[Zn]=0,1.65=6,5(g)`
`b)m_[dd HCl]=1,1.200=220(g)`
`=>C%_[ZnCl_2]=[0,1.136]/[6,5+220-0,1.2].100~~6%`
\(a,n_{HCl}=0,2.1=0,2\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,1<--0,2------>0,1------->0,1
\(\rightarrow m_{Zn}=0,1.65=6,5\left(g\right)\)
\(b,m_{ddHCl}=200.1,1=220\left(g\right)\)
\(\rightarrow m_{dd}=220+6,5-0,1.2=226,3\left(g\right)\\ \rightarrow C\%_{ZnCl_2}=\dfrac{0,1.136}{226,3}.100\%=6\%\)
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)
=> \(C\%=\dfrac{27,2}{212,6}.100\%=12,8\%\)
\(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\\ pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,4 0,8 0,4 0,4
\(a,V_{H_2}=0,4.22,4=8,96\left(l\right)\\ b,C\%_{HCl}=\dfrac{0,8.36,5}{150}.100\%=19,5\%\\ c,m_{\text{dd}}=26+150-\left(0,4.2\right)=175,2\left(g\right)\\ C\%_{ZnCl_2}=\dfrac{0,4.136}{175,2}.100\%=31\%\)