đốt Al trong bình đựng khí Cl2 thu được 26,7(g) AlCl3 tính khối lượng chất tham gia phản ứng Giúp mình với
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\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\)
\(n_{Cl_2}=\dfrac{11.2}{22.4}=0.5\left(mol\right)\)
\(2Al+3Cl_2\underrightarrow{^{^{t^0}}}2AlCl_3\)
Lập tỉ lệ :
\(\dfrac{0.2}{2}< \dfrac{0.5}{3}\Rightarrow Cl_2dư\)
\(n_{Al}=n_{AlCl_3}=0.2\left(mol\right)\)
\(m=0.2\cdot133.5=26.7\left(g\right)\)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{Cl_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\\ PTHH:2Al+3Cl_2\underrightarrow{to}2AlCl_3\\ Vì:\dfrac{0,5}{3}>\dfrac{0,2}{2}\)
=> Al hết, Cl2 dư
=> \(n_{AlCl_3}=n_{Al}=0,2\left(mol\right)\\ m_{AlCl_3}=133,5.0,2=26,7\left(g\right)\)
PTHH: \(2Al+3Cl_2\xrightarrow[]{t^o}2AlCl_3\)
Ta có: \(\left\{{}\begin{matrix}n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\n_{Cl_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,2}{2}< \dfrac{0,5}{3}\) \(\Rightarrow\) Clo còn dư, Nhôm p/ứ hết
\(\Rightarrow n_{AlCl_3}=0,2\left(mol\right)\) \(\Rightarrow m_{AlCl_3}=0,2\cdot133,5=26,7\left(g\right)\)
PTHH: 2Al + 3Cl2 → 2AlCl3
Ta có: \(n_{Al}\) = 5,4/27 = 0,2 (mol)
\(n_{Cl_2}\) = 11,2/22,4 = 0,5 (mol)
Theo tỉ lệ PTPƯ, ta có: \(\dfrac{0,2}{2}\)< \(\dfrac{0,5}{3}\) => Clo dư, Al phản ứng hết.
Theo PT: nAl = \(n_{AlCl_3}\) = 0,2 (mol)
=> \(m_{AlCl_3}\)= 0,2 . 133,5 = 26,7 (g)
\(n_{Fe}=\dfrac{6,8}{56}=0,12mol\)
3Fe + 2O2 \(\underrightarrow{t^o}\) Fe3O4
0,12 0,08 0,04 ( mol )
a, \(V_{O_2}=0,08.22,4=1,792l\)
b, mFe3O4 = 0,04.232 = 9,28g
\(n_{Fe}=\dfrac{6,8}{56}=\dfrac{17}{140}(mol)\\ PTHH:3Fe+2O_2\xrightarrow{t^o}Fe_3O_4\\ a,n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{17}{210}(mol)\\ \Rightarrow V_{O_2}=\dfrac{17}{210}.22,4=1,81(g)\\ b,n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{17}{420}(mol)\\ \Rightarrow m_{Fe_3O_4}=\dfrac{17}{420}.232=9,39(g)\)
a, \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, Gọi: mO2 = x (g) ⇒ mAl = 1,5x (g)
Theo ĐLBT KL, có: mAl + mO2 = mAl2O3
⇒ 1,5x + x = 10
⇒ x = 4 (g) = mO2
mAl = 1,5.4 = 6 (g)
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PT: \(4Al+3O_2\underrightarrow{^{t^o}}2Al_2O_3\)
Theo PT: \(n_{Al_2O_3}=\dfrac{1}{2}n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)
\(n_{O_2}=\dfrac{3}{4}n_{Al}=0,15\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,15.24,79=3,7185\left(l\right)\)
\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{5,4}{27}=0,2mol\)
PTHH: 4Al + 3O2 \(\rightarrow\) 2Al2O3
TL: 4 3 2
mol: 0,2 \(\rightarrow\) 0,15 \(\rightarrow\) 0,1
\(m_{Al_2O_3}=n_{Al_2O_3}.M_{Al_2O_3}=0,1.102=10,2g\)
\(V_{O_2}=n_{O_2}.22,4=0,15.22,4=3,36L\)
\(n_{HCl}=\dfrac{150.7,3\%}{36,5}=0,3\left(mol\right)\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\\ a,n_{Al}=n_{AlCl_3}=\dfrac{2}{6}.0,3=0,1\left(mol\right)\\ \Rightarrow m_{Al}=0,1.27=2,7\left(g\right)\\ b,m_{AlCl_3}=0,1.133,5=13,35\left(g\right)\\ c,n_{H_2}=\dfrac{3}{6}.0,3=0,15\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,15.22,4=3,36\left(l\right)\)
\(n_{AlCl_3}=\dfrac{26,7}{133,5}=0,2\left(mol\right)\)
PT: \(2Al+3Cl_2\underrightarrow{t^o}2AlCl_3\)
Theo PT: \(n_{Al}=n_{AlCl_3}=0,2\left(mol\right)\Rightarrow m_{Al}=0,2.27=5,4\left(g\right)\)
\(n_{Cl_2}=\dfrac{3}{2}n_{AlCl_3}=0,3\left(mol\right)\Rightarrow m_{Cl_2}=0,3.71=21,3\left(g\right)\)