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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: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,6\left(mol\right)\\n_{AlCl_3}=0,2\left(mol\right)\\n_{H_2}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\m_{AlCl_3}=0,2\cdot133,5=26,7\left(g\right)\\V_{HCl}=\dfrac{0,6}{1,5}=0,4\left(l\right)=400\left(ml\right)\\C_{M_{AlCl_3}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\end{matrix}\right.\)
đổi 200 ml = 0,02 l
a) PTHH : Fe + HCl -> FeCl2 + H2
b) \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(=>V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(C_{HCl}=\dfrac{n}{V}=\dfrac{0,1}{0,02}=5\left(M\right)\)
Đông Hải làm câu 1 rồi thì tui làm phần còn lại
Câu 2:
\(a,PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\\ b,n_{CuO}=\dfrac{m}{M}=\dfrac{8}{80}=0,1\left(mol\right)\\ Theo.PTHH:n_{Cu}=n_{H_2}=n_{CuO}=0,1\left(mol\right)\\ V_{H_2\left(đktc\right)}=n.22,4=0,1.22,4=2,24\left(l\right)\\ c,m_{Cu}=n.M=0,1.64=6,4\left(g\right)\\ d,PTHH:2H_2+O_2\underrightarrow{t^o}2H_2O\left(2\right)\\ Theo.PTHH\left(2\right):n_{H_2O}=n_{H_2}=0,1\left(mol\right)\)
\(m_{H_2O}=n.M=0,1.18=1,8\left(g\right)\)
nZn= 13/65=0,2(mol)
a) PTHH: Zn + 2 HCl -> ZnCl2 + H2
b) nH2=nZnCl2=nZn=0,2(mol)
=>V(H2,đktc)=0,2 x 22,4= 4,48(l)
c) khối lượng muối sau phản ứng chứ nhỉ?
mZnCl2=136.0,2=27,2(g)
\(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
\(n_{HCl}=2.0,2=0,4\left(mol\right)\)
PTHH :
\(CuO+2HCl\rightarrow CuCl_2+H_2\uparrow\)
trc p/ư: 0,15 0,4
p/ư : 0,15 0,3 0,15 0,15
sau p/ư : 0 0,1 0,15 0,15
--> sau p/ư : HCl dư
\(a,m_{CuCl_2}=0,15.135=20,25\left(g\right)\)
\(b,C_{M\left(CuCl_2\right)}=\dfrac{0,15}{0,2}=0,75\left(M\right)\)
\(a)n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\\ n_{HCl}=0,2.2=0,4\left(mol\right)\\ CuO+2HCl\xrightarrow[]{}CuCl_2+H_2\\ \dfrac{0,15}{1}< \dfrac{0,4}{2}\Rightarrow HCl.dư\\ n_{CuCl_2}=n_{CuO}=n_{H_2}=0,15mol\\ m_{CuCl_2}=0,15.135=20,25\left(g\right)\\ b)C_{MCuCl_2}=\dfrac{0,15}{0,2}=0,75\left(M\right)\\ n_{HCl\left(pư\right)}=0,15.2=0,3\left(mol\right)\\ n_{HCl\left(dư\right)}=0,4-0,3=0,1\left(mol\right)\\ C_{MHCl\left(dư\right)}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)
Câu 1
\(a)PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\
b)200ml=0,2l\\
n_{HCl}=0,2.1=0,2mol\\
n_{H_2}=n_{MgCl_2}=\dfrac{1}{2}n_{H_2}=\dfrac{1}{2}\cdot0,2=0,1mol\\
V_{H_2}=0,1.24,79=2,479l\\
c)C_{M_{MgCl_2}}=\dfrac{0,1}{0,2}=0,5M\)
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`
\(a)Mg+2HCl\rightarrow MgCl_2+H_2\)
\(b)n_{Mg}=\dfrac{3}{24}=0,125mol\\ n_{HCl}=0,1.1=0,1mol\\ \Rightarrow\dfrac{0,125}{1}>\dfrac{0,1}{2}\Rightarrow Mg.dư\\ n_{H_2}=n_{MgCl_2}=\dfrac{0,1}{2}=0,05mol\\ V_{H_2}=0,05.24,79=1,2395l\\ c)C_{M_{MgCl_2}}=\dfrac{0,05}{0,1}=0,5M\)
Đoạn xét tỉ lệ phải là \(\dfrac{0,125}{1}>\dfrac{0,1}{2}\) em nhé.
\(n_{HCl}=0,3.2=0,6\left(mol\right)\\a, 2Al+6HCl\rightarrow2AlCl_3+3H_2\\ b,n_{H_2}=\dfrac{3}{6}.0,6=0,3\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ c,n_{Al}=n_{AlCl_3}=\dfrac{2}{6}.0,6=0,2\left(mol\right)\\ m_{Al}=0,2.27=5,4\left(g\right)\\ d,V_{ddAlCl_3}=V_{ddHCl}=0,3\left(l\right)\\ C_{MddHCl}=\dfrac{0,2}{0,3}=\dfrac{2}{3}\left(M\right)\)