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\(a)n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ 2Al+6HCl\xrightarrow[]{}2AlCl_3+3H_2\\ n_{H_2}=\dfrac{3}{2}n_{Al}=\dfrac{3}{2}\cdot0,4=0,6\left(mol\right)\\ V_{H_2}=0,6.22,4=13,44\left(l\right)\\ b)n_{HCl}=3n_{Al}=3.0,4=1,2\left(mol\right)\\ m_{HCl}=1,2.36,5=43,8\left(g\right)\\ m_{dd_{HCl}}=\dfrac{43,8}{10,95\%}\cdot100\%=400\left(g\right)\\ c)n_{AlCl_3}=n_{Al}=0,4mol\\ m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\\ m_{H_2}=0,6.2=1,2\left(g\right)\\ m_{dd_{AlCl_3}}=10,8+400-1,2=409,6\left(g\right)\\ C_{\%AlCl_3}=\dfrac{53,4}{409,6}\cdot100\%\approx13\%\)
`n_[Al]=[2,7]/27=0,1(mol)`
`2Al + 6HCl -> 2AlCl_3 + 3H_2 \uparrow`
`0,1` `0,3` `0,1` `0,15` `(mol)`
`a)V_[H_2]=0,15.22,4=3,36(l)`
`b)V_[dd HCl]=[0,3]/2=0,15(l)`
`=>C_[M_[AlCl_3]]=[0,1]/[0,15]~~0,67(M)`
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ pthh:2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,1 0,3 0,1 0,15
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\\ V_{HCl}=\dfrac{0,3}{2}=0,15\left(l\right)\\ C_{M\left(AlCl_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}M\)
\(n_{Al}=\frac{10,8}{27}=0,4\left(mol\right)\)
\(2Al+6HCl->2AlCl_3+3H_2\) (1)
theo (1) \(n_{H_2}=\frac{3}{2}n_{Al}=0,6\left(mol\right)\)
=> \(V_{H_2}=0,6.22,4=13,44\left(l\right)\)
Cho 10,08 g nhom tac dung vua du voi dung dich axit HCl.2M
a) viet phuong trinh phan ung va tinh the tich H2(dktc)
b) tinh the tich dung dich axit HCl.2M da dung
\(n_{Al}=\dfrac{4.5}{27}=\dfrac{1}{6}\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(\dfrac{1}{6}.....0.5.......\dfrac{1}{6}.......0.25\)
\(m_{HCl}=0.5\cdot36.5=18.25\left(g\right)\)
\(m_{AlCl_3}=\dfrac{1}{6}\cdot133.5=22.25\left(g\right)\)
\(V_{H_2}=0.25\cdot22.4=5.6\left(l\right)\)
câu 1 PTHH:Fe+2HCl\(\xrightarrow[]{}\)FeCl2+H2
nFe=\(\dfrac{5,6}{56}\)=0,1 mol
a) theo đầu bài ta có
nFe=nH2=0,1 mol
lượng khí H2 tạo ra ở điều kiện tiêu chuẩn là
V=n.22,4
VH2=0,1.22,4= 2,24 (l)
Cau 2
Ta có pthh
2Al + 6HCl \(\rightarrow\) 2AlCl3 + 3H2
Theo đề bài ta có
nAl=\(\dfrac{10,8}{27}=0,4mol\)
a, Theo pthh
nH2=\(\dfrac{3}{2}nAl=\dfrac{3}{2}.0,4=0,6mol\)
\(\Rightarrow\) VH2=0,6.22,4=13,44 l
b, Theo pthh
nHCl=\(\dfrac{6}{2}.nAl=\dfrac{6}{2}.0,4=1,2mol\)
\(\Rightarrow mHCl=1,2.36,5=43,8g\)
\(\Rightarrow m\text{dd}_{HCl}=\dfrac{mct.100\%}{C\%}=\dfrac{43,8.100\%}{10,95\%}=400g\)
Theo pthh
nAlCl3=nAl=0,4 mol
\(\Rightarrow\) mAlCl3=0,4.133,5=53,4 g
mdd\(_{AlCl3}\)= mAl + m\(_{\text{dd}HCl}\) - mck = 10,8 +400 - ( 0,6.2)=409,6 g
\(\Rightarrow\) Nồng độ % của chất sau phản ứng là :
C%=\(\dfrac{mct}{m\text{dd}}.100\%=\dfrac{53,4}{409,6}.100\%\approx13,04\%\)
nAl = 5.4 / 27 = 0.2 (mol)
2Al + 6HCl => 2AlCl3 + 3H2
0.2......0.6............0.2.......0.3
a) VH2 = 0.3 * 22.4 = 6.72 (l)
b) mAlCl3 = 0.2 * 133.5 = 26.7 (g)
c) VddHCl = 0.6 / 1.5 = 0.4 (l)
d) CMAlCl3 = 0.2 / 0.4 = 0.5 (M)
PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,6\left(mol\right)\\n_{AlCl_3}=0,2\left(mol\right)\\n_{H_2}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\m_{AlCl_3}=0,2\cdot133,5=26,7\left(g\right)\\V_{HCl}=\dfrac{0,6}{1,5}=0,4\left(l\right)=400\left(ml\right)\\C_{M_{AlCl_3}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\end{matrix}\right.\)
a) \(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PTHH: `Fe + 2HCl -> FeCl_2 + H_2`
0,05->0,1----->0,05---->0,05
`=> V_{ddHCl} = (0,1)/2 = 0,05 (l)`
b) `V_{H_2} = 0,05.22,4 = 1,12 (l)`
c) `C_{M(FeCl_2)} = (0,05)/(0,05) = 1M`
nAl=m/M=10,8/27=0,4 (mol)
PT:
2Al + 6HCl -> 2AlCl3 + 3H2\(\uparrow\)
2............6............2..............3 (mol)
0,4 -> 1,2 -> 0,4 ->0,6 (mol)
Khí thoát ra là H2
VH2=n.22,4= 0,6.22,4=13,44 (lít)
b) Vd d HCl=n.CM=1,2.2=2,4 (lít)
CM AlCl3=\(\dfrac{n}{V}=\dfrac{0,4}{2,4}\approx0,17\left(M\right)\)
nAl = 10,8/27 = 0,4 mol
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
Theo PTHH nH2 = 3/2nAl = 3/2 . 0,4 = 0,6 mol
=> VH2 = 0,6.22,4 = 13,44 lít
b:Theo PTHH nHCl = 3nAl = 0,4.3 = 1,2 mol
Vdd = n.CM = 1,2.2 = 2,4 lít
Theo PTHH nAlCl3 = nAl = 0,4 mol
CM của AlCl3 = 0,4/2,4 = 0,17 M
chúc bạn học tốt :))