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\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,4
0,1 0,2
0 0,2 0,1 0,1
\(a,V_{H_2}=0,1.22,4=2,24\left(l\right)\\ b,m_{dd}=6,5+0,4.36,5+50-0,1.2=70,9\left(g\right)\\ C\%_{ZnCl_2}=\dfrac{0,1.136}{70,9}.100\%=19,18\%\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,1 0,1 0,1
\(b,C_M=\dfrac{0,1}{0,1}=1M\)
\(c,V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(n_{Zn}=\dfrac{6.5}{65}=0.1\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.1.....0.2...........0.1..........0.1\)
\(m_{HCl}=0.2\cdot36.5=7.3\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng}}=6.5+146-0.1\cdot2=152.3\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{136\cdot0.1}{152.3}\cdot100\%=8.92\%\)
Theo gt ta có: $n_{Zn}=0,1(mol);n_{CuO}=0,25(mol)$
a, $Zn+2HCl\rightarrow ZnCl_2+H_2$
$CuO+H_2\rightarrow Cu+H_2O$
b, Ta có: $n_{ZnCl_2}=0,1(mol)\Rightarrow m_{ZnCl_2}=13,6(g)$
b, Ta có: $n_{H_2}=0,1(mol)$
Sau phản ứng chất còn dư là CuO dư 0,15 mol
$\Rightarrow m_{CuO/du}=12(g)$
a)
$Zn + 2HCl \to ZnCl_2 + H_2$
$CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
b)
n ZnCl2 = n Zn = 6,5/65 = 0,1(mol)
=> m ZnCl2 = 0,2.136 = 13,6(gam)
c) n H2 = n Zn = 0,1 mol
CuO + H2 --to--> Cu + H2O
n CuO = 20/80 = 0,25 > n H2 = 0,1 nên CuO dư
n CuO pư = n H2 = 0,1 mol
=> m CuO dư = 20 - 0,1.80 = 12(gam)
\($a/$\\ Zn+2HCl \to ZnCl_2+H_2\\ b/\\ n_{Zn}=0,1(mol)\\ n_{HCl}=0,1.2=0,2(mol)\\ m_{ddHCl}=\frac{0,2.36,5.100}{7,3}=100(g)\\ C\%_{ZnCl_2}=\frac{0,1.136}{100+6,5-0,1.2}.100\%=12,8\%\)
\(a/\\ Zn+2HCl \to ZnCl_2+H_2\\ b/\\ n_{Zn}=\frac{6,5}{65}=0,1(mol)\\ n_{HCl}=0,2(mol)\\ m_{ddsaupu}=\frac{0,1.36,5.100}{7,3}+6,5-0,1.2=56,3(g)\\ C\%_{ZnCl_2}=\frac{0,1.136}{56,3}.100\%=24,16\%\)
\(n_{Fe}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PT :
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,1 0,2 0,1 0,1
\(a,V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(b,m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(C\%=\dfrac{7,3}{73}.100\%=10\%\)
\(c,m_{ddZnCl_2}=6,5+73-\left(0,1.2\right)79,3\left(g\right)\)
\(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{13,6}{79,3}.100\%=17,15\%\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,1 2
Vì 0,1/1<2/2
nên tính theo Zn
=>\(n_{H_2}=n_{Zn}=0.1\left(mol\right)\) và nHCl=0,2(mol)
\(V=0.1\cdot22.4=2.24\left(lít\right)\)
\(C\%\left(muối\right)=\dfrac{0.1\cdot136}{6.5+73-0.2}\simeq17,15\%\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1-->0,2
=> \(C_{M\left(dd.HCl\right)}=\dfrac{0,2}{0,2}=1M\)
`n_(Zn) = (6,5)/65 = 0,1 (mol)`
`PTHH: ZN + 2HCl --> ZnCl_2 + H_2`
`0,1 --> 0,2`
`=> C_(M(dd.HCl) = (0,2)/(0,2) = 1M`