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\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ pthh:2Al+6HCl\rightarrow2AlCl_3+3H_2\)
Mol : 0,4 0,4 0,6
\(m_{AlCl_3}=133,5.0,4=53,4\left(g\right)\\ V_{H_2}=0,6.22,4=13,44\left(l\right)\)
\(n_{CuO}=\dfrac{8}{80}=0,8\left(mol\right)\\
pthh:CuO+H_2\underrightarrow{t^o}Cu+H_2O\\
LTL:\dfrac{0,8}{1}>\dfrac{0,6}{1}\)
=> CuO dư
\(n_{CuO\left(p\text{ư}\right)}=n_{Cu}=n_{H_2}=0,6\left(mol\right)\\
m_{CuO\left(d\right)}=\left(0,8-0,6\right).80=16\left(g\right)\\
m_{Cu}=0,6.64=38,4\left(g\right)\\
m_{cr}=16+38,4=54,4\left(g\right)\)
a) \(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)
PTHH: Mg + 2HCl --> MgCl2 + H2
0,3--------------->0,3--->0,3
=> \(m_{MgCl_2}=0,3.95=28,5\left(g\right)\)
b)
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c)
\(n_{CuO}=\dfrac{32}{80}=0,4\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
Xét tỉ lệ: \(\dfrac{0,4}{1}>\dfrac{0,3}{1}\) => CuO dư, H2 hết
PTHH: CuO + H2 --to--> Cu + H2O
0,3<--0,3------->0,3
=> mchất rắn = 32 - 0,3.80 + 0,3.64 = 27,2 (g)
a) \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,4-------------->0,4-->0,6
=> \(m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\)
b) \(V_{H_2}=0,6.22,4=13,44\left(l\right)\)
c) \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,6}{1}\) => CuO hết, H2 dư
PTHH: CuO + H2 --to--> Cu + H2O
0,1------------>0,1
=> mchất rắn = 0,1.64 = 6,4 (g)
a, \(m_{HCl}=150.7,3\%=10,95\left(g\right)\Rightarrow n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\)
PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
Theo PT: \(n_{Mg}=n_{MgCl_2}=n_{H_2}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\)
\(m_{Mg}=0,15.24=3,6\left(g\right)\)
b, \(V_{H_2}=0,15.22,4=3,36\left(l\right)\)
c, Ta có: m dd sau pư = 3,6 + 150 - 0,15.2 = 153,3 (g)
\(\Rightarrow C\%_{MgCl_2}=\dfrac{0,15.95}{153,3}.100\%\approx9,3\%\)
a, PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
Ta có: \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
b, Theo PT: \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.24,79=4,958\left(l\right)\)
c, Theo PT: \(n_{MgCl_2}=n_{Mg}=0,2\left(mol\right)\)
\(\Rightarrow m_{MgCl_2}=0,2.95=19\left(g\right)\)
a,Mg+2HCl=>MgCl2+H2
b,nHCl=0,05.3=0,15(mol)
nMg=12/24=0,5(mol)=>Mg dư, tính thao HCl
nH2=1/2 nHCl=0,075(mol)
=>VH2=0,075.22,4=1,68(l)
c,nMgCl2=nH2=0,075(mol)
mMgCl2=0,075.95=7,125(g)
a)\(Mg+2HCl\rightarrow MgCl_2+H_2\)
b) \(n_{Mg}=\dfrac{12}{24}=0,5\left(mol\right)\)
\(n_{HCl}=0,05.3=0,15\)
Ta có \(\dfrac{0,15}{2}< \dfrac{0,5}{1}\)nên Mg dư, tính theo HCl
\(n_{H_2}=\dfrac{n_{HCl}}{2}=0,075\left(mol\right)\)
\(V_{H_2}=0,075.22,4=1,68\left(l\right)\)
c) \(n_{MgCl_2}=\dfrac{n_{HCl}}{2}=0,075\left(mol\right)\)
\(m_{MgCl_2}=0,075.95=7,125g\)
\(n_{HCl}=0,2.2=0,4\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=n_{FeCl_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ a,m_{Fe}=0,2.56=11,2\left(g\right)\\ b,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,V_{ddFeCl_2}=V_{ddHCl}=0,2\left(l\right)\\ C_{MddFeCl_2}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(a,n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\\ PTHH:Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\left(1\right)\\ Theo.pt\left(1\right):n_{H_2}=n_{MgSO_4}=n_{Mg}=0,1\left(mol\right)\\ V_{H_2}=0,1.22,4=2,24\left(l\right)\\ m_{MgSO_4}=0,1.120=12\left(g\right)\\ b,PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\left(2\right)\\ Theo.pt\left(2\right):n_{Cu}=n_{H_2}=0,1\left(mol\right)\\ m_{Cu}=0,1.64=6,4\left(g\right)\)
\(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\\ pthh:Mg+2HCl\rightarrow MgCl_2+H_2\)
0,3 0,3 0,3
\(m_{MgCl_2}=0,3.95=28,5g\\ V_{H_2}=0,3.22,4=6,72l\\ n_{CuO}=\dfrac{3}{80}=0,0375\left(mol\right)\\ pthh:CuO+H_2\underrightarrow{t^o}Cu+H_2O\\ LTL:\dfrac{0,0375}{1}>\dfrac{0,3}{1}\)
=>Hidro dư
\(n_{Cu}=n_{CuO}=0,0375\left(mol\right)\\ m_{Cu}=0,0375.64=2,4\left(g\right)\)