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nAl = 8,1 /27 = 0,3mol
2Al + 6HCl => 2AlCl3 + 3H2
0,3--------------->0,3------> 0,45
=> VH2 = 0,45.22,4 = 10,08 (l)
mAlCl3 = 0,3. 133,5 = 40,05 (g)
\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{5,4}{27}=0,2mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,2 0,3 ( mol )
\(V_{H_2}=n_{H_2}.22,4=0,3.22,4=6,72l\)
\(m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,2.133,5=26,7g\)
a, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
b, \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
\(n_{H_2}=\dfrac{3}{2}n_{Al}=0,45\left(mol\right)\Rightarrow V_{H_2}=0,45.22,4=10,08\left(l\right)\)
c, \(n_{AlCl_3}=n_{Al}=0,3\left(mol\right)\Rightarrow m_{AlCl_3}=0,3.133,5=40,05\left(g\right)\)
d, \(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)
PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Có: \(\dfrac{0,2}{1}>\dfrac{0,45}{3}\) → Fe2O3 dư.
\(n_{Fe}=\dfrac{2}{3}n_{H_2}=0,3\left(mol\right)\Rightarrow m_{Fe}=0,3.56=16,8\left(g\right)\)
a)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,2----------->0,2----->0,3
=> \(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
b) \(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
c)
PTHH: Zn + H2SO4 --> ZnSO4 + H2
0,3<----------------0,3
=> \(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)
\(a,n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH:
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2--------------->0,2------->0,3
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\\ b,m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
c, PTHH:
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
0,2<------------------0,2
\(m_{H_2SO_4}=0,2.98=19,6\left(g\right)\)
Áp dụng ĐLBTKL, ta có:
\(10,8+43,8=m_{AlCl_3}+\dfrac{6,72}{22,4}.2\)
\(\Leftrightarrow m_{AlCl_3}=10,8+43,8-0,6=54\left(g\right)\)
a)
2Al + 6HCl → 2AlCl3 + 3H2
b) nAl = 5,4 : 27 = 0,2 mol
Theo tỉ lệ phản ứng => nH2 = 0,3 mol <=> VH2 = 0,3.22,4 = 6,72 lít.
c) nAlCl3 = nAl = 0,2 mol
=> mAlCl3 = 0,2. 133,5 = 26,7 gam.
d) nHCl cần dùng = 3nAl = 0,6 mol
=> mHCl = 0,6.36,5 = 21,9 gam
<=> mdd HCl cần dùng = \(\dfrac{21,9}{3,65\%}\) = 600 gam
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15(mol)\\ a,2Al+6HCl\to 2AlCl_3+3H_2\\ \Rightarrow n_{Al}=n_{AlCl_3}=0,1(mol);n_{HCl}=0,3(mol)\\ b,m_{Al}=0,1.27=2,7(g);m_{HCl}=0,3.36,5=10,95(g)\\ m_{AlCl_3}=0,1.133,5=13,35(g)\\ c,n_{Al}=\dfrac{16,2}{27}=0,6(mol)\\ \Rightarrow n_{H_2}=1,5n_{Al}=0,9(mol)\\ \Rightarrow V_{H_2}=0,9.22,4=20,16(l)\)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
______0,2-->0,6--------------->0,3
=> mHCl = 0,6.36,5 = 21,9 (g)
b) VH2 = 0,3.22,4 = 6,72 (l)
a) nAl=5,427=0,2(mol)���=5,427=0,2(���)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
______0,2-->0,6--------------->0,3
=> mHCl = 0,6.36,5 = 21,9 (g)
b) VH2 = 0,3.22,4 = 6,72 (l)
2Al+6HCl->2AlCl3+3H2
0,4-----1,2--------------0,6 mol
n HCl=\(\dfrac{43,8}{36,5}\)=1,2 mol
=>VH2=0,6.22,4=13,44l
=>m Al=0,4.27=10,8g