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a. PTHH: Fe + 2HCl ===> FeCl2 + H2
0,2----0,4------------0,2-----0,2
Số mol Fe: nFe = 11,2\56=0,2(mol)
=> Thể tích H2 thu được: VH2(đktc) = 0,2 x 22,4 = 4,48 (lít)
c. Theo phương trình, nHCl = 2nFe = 0,4 (mol)
=> Khối lượng HCl cần dùng là: mHCl = 0,4 x 36,5 = 14,6 (gam)
=> thiếu điều kieenj ý d)
\(Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\\ n_{H_2}=n_{MgCl_2}=n_{Mg}=0,1\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ b,m_{MgCl_2}=95.0,1=9,5\left(g\right)\\ c,m_{ddMgCl_2}=m_{Mg}+m_{ddHCl}-m_{H_2}=2,4+200-0,1.2=202,2\left(g\right)\\ C\%_{ddMgCl_2}=\dfrac{9,5}{202,2}.100\approx4,698\%\\ d,n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\\ PTHH:H_2+CuO\rightarrow\left(t^o\right)Cu+H_2O\\ Vì:\dfrac{0,2}{1}>\dfrac{0,1}{1}\Rightarrow CuOdư\\ n_{CuO\left(dư\right)}=0,2-0,1.1=0,1\left(mol\right)\\ m_{CuO\left(dư\right)}=0,1.80=8\left(g\right)\)
\(a)Mg+2HCl\rightarrow MgCl_2+H_2\)
\(b)n_{Mg}=\dfrac{3}{24}=0,125mol\\ n_{HCl}=0,1.1=0,1mol\\ \Rightarrow\dfrac{0,125}{1}>\dfrac{0,1}{2}\Rightarrow Mg.dư\\ n_{H_2}=n_{MgCl_2}=\dfrac{0,1}{2}=0,05mol\\ V_{H_2}=0,05.24,79=1,2395l\\ c)C_{M_{MgCl_2}}=\dfrac{0,05}{0,1}=0,5M\)
Đoạn xét tỉ lệ phải là \(\dfrac{0,125}{1}>\dfrac{0,1}{2}\) em nhé.
\(a/2Al+6HCl\xrightarrow[]{}2AlCl_3+3H_2\\ b/n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{AlCl_3}=n_{Al}=0,2mol\\ m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\\ c/higro\Rightarrow hydrogen\\ n_{H_2}=\dfrac{0,2.3}{2}=0,3\left(mol\right)\\ V_{H_2}=0,3.24,79=7,437\left(l\right)\\ d/n_{HCl}=\dfrac{0,2.6}{2}=0,6\left(mol\right)\\ V_{HCl}=\dfrac{0,6}{2}=0,3\left(l\right)\)
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\
pthh:Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(V_{H_2}=0,1.22,4=2,24\left(l\right)\\
m_{HCl}=\dfrac{\left(0,2.36,5\right).100}{24,5}=29,795\left(g\right)\\
m_{\text{dd}}=5,6+29,795-\left(0,1.2\right)=35,195\left(g\right)\\
C\%=\dfrac{0,1.127}{35,195}.100\%=36\%\)
câu 1
\(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\\ pthh:Fe+2HCl\rightarrow FeCl_2+H_2\)
0,25 0,5 0,25 0,25
\(m_{FeCl_2}=0,25.127=31,75g\\
V_{H_2}=0,25.22,4=5,6\\
C_{M\left(HCl\right)}=\dfrac{0,5}{0,2}=2,5M\)
câu 2
1 ) \(m_{\text{dd}}=35+100=135g\\
2,C\%=\dfrac{204}{204+100}.100=60\%\\
=>m\text{dd}=\dfrac{100.204}{60}=340g\)
a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Fe}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{H_2SO_4}=n_{Fe}=0,1\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)
\(n_{CaCO_3}=\dfrac{50}{100}=0,5\left(mol\right)\\ a,PTHH:CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\\ b,n_{CO_2}=n_{CaCl_2}=n_{CaCO_3}=0,5\left(mol\right)\\ V_{CO_2\left(25^oC,1bar\right)}=0,5.24,79=12,395\left(l\right)\\ c,n_{HCl}=2.0,5=1\left(mol\right)\\ V_{ddHCl}=\dfrac{1}{0,2}=5\left(l\right)\\ d,m_{CaCl_2}=111.0,5=55,5\left(g\right)\)