Cho 3,2g natri tác dụng hoàn toàn với khí clo thu được 5,85 natri clorua . tính khối lượng khí clo đã phản ứng.
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Ta có: \(n_{NaCl}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\)
PT: \(2Na+Cl_2\rightarrow2NaCl\)
____0,1___0,05____0,1 (mol)
a, mNa = 0,1.23 = 2,3 (g)
b, VCl2 = 0,05.22,4 = 1,12 (l)
Bạn tham khảo nhé!
Chúc em học tốt !!!
\(a.\)
\(n_{Na}=\dfrac{4.6}{23}=0.2\left(mol\right)\)
\(Na+\dfrac{1}{2}Cl_2\underrightarrow{t^0}NaCl\)
\(0.2........0.1........0.2\)
\(V_{Cl_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{NaCl}=0.2\cdot58.5=11.7\left(g\right)\)
\(b.\)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{t^0}FeCl_3\)
\(0.1.......0.15.......0.1\)
\(V_{Cl_2}=0.15\cdot22.4=3.36\left(l\right)\)
\(m_{FeCl_3}=0.1\cdot162.5=16.25\left(g\right)\)
\(c.\)
\(n_{Cu}=\dfrac{6.4}{64}=0.1\left(mol\right)\)
\(Cu+Cl_2\underrightarrow{t^0}CuCl_2\)
\(0.1......0.1.....0.1\)
\(V_{Cl_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{CuCl_2}=0.1\cdot135=13.5\left(g\right)\)
Bài 1:
a. \(n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right)\)
\(2Na+Cl_2\rightarrow2NaCl\)
0,2 ...... 0,1 ..... 0,2 (mol)
\(\rightarrow\left\{{}\begin{matrix}V_{Cl_2}=0,1.22,4=2,24\left(l\right)\\m_{NaCl}=0,2.58,5=11,7\left(g\right)\end{matrix}\right.\)
b. \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(2Fe+3Cl_2\rightarrow2FeCl_3\)
0,1 ...... 0,15 ...... 0,1 (mol)
\(\rightarrow\left\{{}\begin{matrix}V_{Cl_2}=0,15.22,4=3,36\left(l\right)\\m_{FeCl_3}=0,1.162,5=16,25\left(g\right)\end{matrix}\right.\)
c. \(n_{Cu}=\dfrac{6,4}{64}=0,1\left(mol\right)\)
\(Cu+Cl_2\rightarrow CuCl_2\)
0,1 .... 0,1 ..... 0,1 (mol)
\(\rightarrow\left\{{}\begin{matrix}V_{Cl_2}=0,1.22,4=2,24\left(l\right)\\m_{CuCl_2}=0,1.135=13,5\left(g\right)\end{matrix}\right.\)
a) $2Al + 3Cl_2 \xrightarrow{t^o} 2AlCl_3$
b) $n_{Al} = \dfrac{5,4}{27} = 0,2(mol)$
Theo PTHH : $n_{Cl_2} = \dfrac{3}{2}n_{Al} = 0,3(mol)$
$\Rightarrow V_{Cl_2} = 0,3.24,79 = 7,437(lít)$
c) $n_{AlCl_3} = n_{Al} = 0,2(mol)$
$\Rightarrow m_{AlCl_3} = 0,2.133,5 = 26,7(gam)$
Bài 1:
Na2O + H2O → 2NaOH
Bài 2:
a) 2Fe + 3Cl2 → 2FeCl3
b) Áp dụng định luật bảo toàn khối lượng ta có:
\(m_{Fe}+m_{Cl_2}=m_{FeCl_3}\)
\(\Rightarrow m_{FeCl_3}=11,2+21,3=32,5\left(g\right)\)
PT: \(2Na+Cl_2\underrightarrow{t^o}2NaCl\)
Ta có: \(n_{NaCl}=\dfrac{4,68}{58,5}=0,08\left(mol\right)\)
Theo PT: \(\left\{{}\begin{matrix}n_{Na\left(LT\right)}=n_{NaCl}=0,08\left(mol\right)\\n_{Cl_2\left(LT\right)}=\dfrac{1}{2}n_{NaCl}=0,04\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Na\left(LT\right)}=0,08.23=1,84\left(g\right)\\V_{Cl_2\left(LT\right)}=0,04.22,4=0,896\left(l\right)\end{matrix}\right.\)
Mà: H% = 80%
\(\Rightarrow\left\{{}\begin{matrix}m_{Na\left(TT\right)}=\dfrac{1,84}{80\%}=2,3\left(g\right)\\V_{Cl_2\left(TT\right)}=\dfrac{0,896}{80\%}=1,12\left(l\right)\end{matrix}\right.\)
Bạn tham khảo nhé!
Câu 1:
\(2Na+Br_2\rightarrow2NaBr\\ n_{NaBr}=\dfrac{61,8}{103}=0,6\left(mol\right)\\ n_{Na}=n_{NaBr}=0,6\left(mol\right)\\ n_{Br_2}=\dfrac{0,6}{2}=0,3\left(mol\right)\\ \Rightarrow a=m_{Na}=0,6.23=13,8\left(g\right)\\ m_{Br_2}=0,3.160=48\left(g\right)\\ m_{ddBr_2}=\dfrac{48}{5\%}=960\left(g\right)\)
Câu 2:
\(2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ n_{FeCl_3}=\dfrac{40,625}{162,5}=0,25\left(mol\right)\\ n_{Fe}=n_{FeCl_3}=0,25\left(mol\right)\\ \Rightarrow m=m_{Fe}=0,25.56=14\left(g\right)\\ n_{Cl_2}=\dfrac{3}{2}.0,25=0,375\left(mol\right)\\ V_{Cl_2\left(đktc\right)}=0,375.22,4=8,4\left(l\right)\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ 2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ n_{Cl_2}=\dfrac{3}{2}.0,2=0,3\left(mol\right)\\ n_{FeCl_3}=n_{Fe}=0,2\left(mol\right)\\ a,V_{Cl_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ b,m_{FeCl_3}=162,5.0,2=32,5\left(g\right)\)
a, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
PT: \(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)
Theo PT: \(n_{Cl_2}=\dfrac{3}{2}n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow V_{Cl_2}=0,3.22,4=6,72\left(l\right)\)
b, \(n_{FeCl_3}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeCl_3}=0,2.162,5=32,5\left(g\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right);n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\a, Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,V\text{ì}:\dfrac{0,2}{1}>\dfrac{0,1}{1}\Rightarrow Zn\text{dư}\\ \Rightarrow n_{Zn\left(p.\text{ứ}\right)}=n_{ZnCl_2}=n_{H_2}=0,1\left(mol\right)\\b, m_{Zn\left(p.\text{ứ}\right)}=0,1.65=6,5\left(g\right)\\ n_{HCl}=0,1.2=0,2\left(mol\right)\\ m_{HCl}=0,2.36,5=7,3\left(g\right)\\ d,m_{ZnCl_2}=136.0,1=13,6\left(g\right)\)
a, PTHH:\(Cu+Cl_2\rightarrow CuCl_2\)
b, \(n_{Cu}=\frac{m}{M}=\frac{12,8}{64}=0,2\left(mol\right)\)
Ta thấy \(n_{CuCl_2}=n_{Cl_2}=n_{Cu}=0,2\left(mol\right)\)
\(V_{Cl_2}=n_{Cl_2}.22,4=0,2.22,4=4,48\left(l\right)\)
c, \(m_{CuCl_2}=n_{CuCl_2}.M=0,2.135=27\left(g\right)\)
Theo ĐLBTKL, ta có:
mNa + mCl\(_2\) = mNaCl
=> mCl\(_2\) = 5,85 - 3,2 = 2,65 ( g )
2Na+Cl2-to>2NaCl
Áp dụng định luật bảo toàn khối lg
mNa+mCl2=m NaCl
mCl2=5,85-3,2=2,65g