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a,\(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,5 1
ko câu hỏi
b, Thiếu thể tích ddHCl
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{HCl}=2.0,05=0,1\left(mol\right);n_{H_2}=n_{Fe}=0,05\left(mol\right)\\ a,V_{ddHCl}=\dfrac{0,1}{2}=0,05\left(l\right)=50\left(ml\right)\\ b,V_{H_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\)
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PT :
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,05 0,1 0,05
\(a,V_{H_2}=0,05.22,4=1,12\left(l\right)\)
\(b,V_{HCl}=\dfrac{n}{C_M}=\dfrac{0,1}{2}=0,05\left(l\right)\)
a) Fe + 2HCl --> FeCl2 + H2
b) \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
_____0,4--->0,8------>0,4--->0,4
=> VH2 = 0,4.22,4 = 8,96(l)
c) mHCl = 0,8.36,5 = 29,2 (g)
=> \(m_{dd\left(HCl\right)}=\dfrac{29,2.100}{7,3}=400\left(g\right)\)
mdd (sau pư) = 22,4 + 400 - 0,4.2 = 421,6 (g)
=> \(C\%\left(FeCl_2\right)=\dfrac{127.0,4}{421,6}.100\%=12,05\%\)
Bài 1 xem lại đề phần 2 nhé=)
3.
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\\ PTHH:\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05->0,1---->0,05---->0,05
a. \(V_{HCl}=\dfrac{0,1}{2}=0,05\left(l\right)\)
b. \(V_{H_2}=0,05.22,4=1,12\left(l\right)\)
c. \(CM_{FeCl_2}=\dfrac{0,05}{0,05}=1M\)
`HaNa♬D`
\(n_{HCl}=0,3.1=0,3\left(mol\right)\\ NaOH+HCl\rightarrow NaCl+H_2O\\ n_{NaOH}=n_{NaCl}=n_{HCl}=0,3\left(mol\right)\\ V_{\text{dd}NaOH}=V=\dfrac{0,3}{2}=0,15\left(l\right)\\ C_{M\text{dd}A}=C_{M\text{dd}NaCl}=\dfrac{0,3}{0,15+0,3}=\dfrac{2}{3}\left(M\right)\)
a, \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
\(m_{HCl}=109,5.10\%=10,95\left(g\right)\Rightarrow n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\)
PTHH: 2Al + 6HCl → 2AlCl3 + 3H2
Mol: 0,1 0,3 0,1 0,15
Ta có: \(\dfrac{0,1}{2}=\dfrac{0,3}{6}\) ⇒ Al hết, HCl hết
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\)
b, \(m_{AlCl_3}=0,1.133,5=13,35\left(g\right)\)
c, mdd sau pứ = 2,7 + 109,5 - 0,15.2 = 111,9 (g)
\(C\%_{ddAlCl_3}=\dfrac{13,35.100\%}{111,9}=11,93\%\)
PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
Ta có: \(\left\{{}\begin{matrix}n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\n_{HCl}=\dfrac{109,5\cdot10\%}{36,5}=0,3\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,1}{2}=\dfrac{0,3}{6}\) \(\Rightarrow\) Al và HCl đều p/ứ hết
\(\Rightarrow\left\{{}\begin{matrix}n_{AlCl_3}=0,1\left(mol\right)\\n_{H_2}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{AlCl_3}=0,1\cdot133,5=13,35\left(g\right)\\V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{H_2}=0,15\cdot2=0,3\left(g\right)\end{matrix}\right.\)
Mặt khác: \(m_{dd}=m_{Al}+m_{ddHCl}-m_{H_2}=111,9\left(g\right)\)
\(\Rightarrow C\%_{AlCl_3}=\dfrac{13,35}{111,9}\cdot100\%\approx11,93\%\)
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