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\(a,n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
0,2-->0,4--------->0,2--->0,2
=> V = 0,2.22,4 = 4,48 (l)
b, Thiếu V dd
\(c,m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
a) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
\(n_{H_2SO_4}=\dfrac{117,6.25\%}{98}=0,3\left(mol\right)\)
PTHH: Mg + H2SO4 --> MgSO4 + H2
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\) => Mg hết, H2SO4 dư
PTHH: Mg + H2SO4 --> MgSO4 + H2
0,2--->0,2------>0,2---->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
b) mdd sau pư = 4,8 + 117,6 - 0,2.2 = 122 (g)
\(\left\{{}\begin{matrix}C\%_{MgSO_4}=\dfrac{0,2.120}{122}.100\%=19,67\%\\C\%_{H_2SO_4.dư}=\dfrac{\left(0,3-0,2\right).98}{122}.100\%=8,03\%\end{matrix}\right.\)
`2Al + 6HCl -> 2AlCl_3 + 3H_2↑`
`0,4` `1,2` `0,6` `(mol)`
`n_[Al] = [ 10,8 ] / 27 = 0,4 (mol)`
`=> m_[dd HCl] = [ 1,2 . 36,5 ] / 20 . 100 = 219 (g)`
`=> V_[H_2] = 0,6 . 22,4 = 13,44 (l)`
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
0,2-------------------------->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
\(a.n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ n_{HCl}=\dfrac{17,8\%.200}{36,5}=\dfrac{356}{365}\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ Vì:\dfrac{0,1}{1}< \dfrac{\dfrac{356}{365}}{2}\\ \Rightarrow Znhết,HCldư\\ n_{HCl\left(dùng\right)}=0,1.2=0,2\left(mol\right)\\ m_{HCl\left(dùng\right)}=0,2.36,5=7,3\left(g\right)\\ b.n_{H_2}=n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ c.n_{HCl\left(Dư\right)}=\dfrac{356}{365}-0,2=\dfrac{283}{365}\left(mol\right)\\ C\%_{ddZnCl_2}=\dfrac{0,1.136}{6,5+200}.100\approx6,586\%\)
\(C\%_{ddHCl\left(dư\right)}=\dfrac{\dfrac{283}{365}.36,5}{6,5+200}.100\approx13,705\%\)
a) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2--->0,4--->0,2--->0,2
=> V = 0,2.22,4 = 4,48 (l)
b) \(C_{M\left(dd.HCl\right)}=\dfrac{0,4}{0,5}=0,8M\)
c) \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
\(m_{H_2O}=D\cdot V=192.7\left(g\right)\)
\(m_{HCl}=a\left(g\right)\)
\(C\%HCl=\dfrac{a}{a+192.7}\cdot100\%=3.65\%\)
\(\Rightarrow a=7.3\)
\(n_{HCl}=\dfrac{7.3}{36.5}=0.2\left(mol\right)\)
\(V_{HCl}=0.2\cdot22.4=4.48\left(l\right)\)
\(C_{M_{HCl}}=\dfrac{0.2}{0.1927}=1.03\left(M\right)\)
Zn+2HCl->ZnCl2+H2
0,4---0,8-----0,4----0,4
n HCl=0,9 mol
n Zn=0,4 mol
=>HCl dư
=>VH2=0,4.22,4=8,96l
=> m muối=0,4.136=54,4g
sao tìm đc nHCL v?