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PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,2.65=13\left(g\right)\)
\(m_{ZnO}=21,1-13=8,1\left(g\right)\)
Có: \(n_{ZnO}=\dfrac{8,1}{81}=0,1\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Zn}+2n_{ZnO}=0,6\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,6.36,5=21,9\left(g\right)\Rightarrow C\%_{ddHCl}=\dfrac{21,9}{200}.100\%=10,95\%\)
Theo PT: \(n_{ZnCl_2}=n_{Zn}+n_{ZnO}=0,3\left(mol\right)\)
\(\Rightarrow m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
Bạn tham khảo nhé!
CcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCcccccccccccccccccccccCccccccccccccccccccccc
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
0,2<--0,4<------0,2<-----0,2
=> \(\left\{{}\begin{matrix}\%m_{Zn}=\dfrac{0,2.65}{21,1}.100\%=61,61\%\\\%m_{ZnO}=100\%-61,61\%=38,39\%\end{matrix}\right.\)
\(n_{ZnO}=\dfrac{21,1-0,2.65}{81}=0,1\left(mol\right)\)
PTHH: ZnO + 2HCl ---> ZnCl2 + H2O
0,1---->0,2------>0,1
=> \(C\%_{HCl}=\dfrac{\left(0,2+0,4\right).36,5}{200}.100\%=10,95\%\)
\(m_{mu\text{ố}i}=m_{ZnCl_2}=\left(0,1+0,2\right).136=40,8\left(g\right)\)
Zn + 2HCl → ZnCl2 + H2
ZnO + HCl → ZnCl2 + H2O
nH2 = 4,48/22,4 = 0,2 mol
=> nZn = nH2 = 0,2 mol
<=> mZn = 0,2.65= 13 gam
<=> %mZn = \(\dfrac{13}{21,1}.100\%\) = 61,6% , %mZnO = 100 - 61,6 = 38,4%.
b. nZnO = \(\dfrac{21,1-13}{81}\) = 0,1 mol
=> nZnCl2 = nZn + nZnO = 0,3 mol
<=> mZnCl2 = 0,3.81 = 24,3 gam.
1.GS có 100g dd $HCl$
=>m$HCl$=100.20%=20g
=>n$HCl$=20/36,5=40/73 mol
=>n$H2$=20/73 mol
Gọi n$Fe$(X)=a mol n$Mg$(X)=b mol
=>n$HCl$=2a+2b=40/73
mdd sau pứ=56a+24b+100-40/73=56a+24b+99,452gam
m$MgCl2$=95b gam
C% dd $MgCl2$=11,79%=>95b=11,79%(56a+24b+99,452)
=>92,17b-6,6024a=11,725
=>a=0,13695 mol và b=0,137 mol
=>C%dd $FeCl2$=127.0,13695/mdd.100%=15,753%
2.Bảo toàn klg=>mhh khí bđ=m$C2H2$+m$H2$
=0,045.26+0,1.2=1,37 gam
mC=mA-mbình tăng=1,37-0,41=0,96 gam
HH khí C gồm $H2$ dư và $C2H6$ không bị hấp thụ bởi dd $Br2$ gọi số mol lần lượt là a và b mol
Mhh khí=8.2=16 g/mol
mhh khí=0,96=2a+30b
nhh khí=0,06=a+b
=>a=b=0,03 mol
Vậy n$H2$=n$C2H6$=0,03 mol
nH2 = \(\dfrac{4,48}{22,4}\) = 0,2 (mol)
Zn + 2HCl ----> ZnCl2 + H2 (1)
ZnO + 2HCl ----> ZnCl2 + H2O (2)
nZn = nZnCl2 (1) = nH2 = 0,2 (mol)
=> mZn = 0.2 x 65 = 13 (g)
=> mZnO = 21,1 - 13 = 8,1 (g)
=> nZnO = 8,1/81 = 0.1 (mol)
nZnCl2 (2) = nZnO = 0.1 (mol)
C%ZnCl2 = \(\dfrac{152\left(0,2+0,1\right)}{21,1+200}\times100\%=20.62\%\)
Đề bảo 21,1 gam, ở đâu ra 13 gam em nhỉ?