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a) Zn + 2HCl --> ZnCl2 + H2
Hiện tượng: Kẽm tan dần, sủi bọt khí
b)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\); \(n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,3}{2}\) => Zn hết, HCl dư
c)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1------------>0,1--->0,1
=> VH2 = 0,1.22,4 = 2,24 (l)
mZnCl2 = 0,1.136 = 13,6 (g)
Câu 1:
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\Rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\Rightarrow m_{Zn}=0,5.36,5=18,25\left(g\right)\)
Câu 2:
a, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
b, \(n_P=\dfrac{1,24}{31}=0,04\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{5}{4}n_P=0,05\left(mol\right)\Rightarrow V_{O_2}=0,05.22,4=1,12\left(l\right)\)
c, \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,02\left(mol\right)\Rightarrow m_{P_2O_5}=0,02.142=2,84\left(g\right)\)
\(n_{HCl}=\dfrac{25}{36,5}=\dfrac{50}{73}mol\)
2Al + 6HCl \(\rightarrow\) 2AlCl3 + 3H2
\(\Rightarrow n_{Al}=\dfrac{\dfrac{50}{73}.2}{6}=\dfrac{50}{219}mol\\ m_{Al}=\dfrac{50}{219}.27=\dfrac{450}{73}g\)
\(n_{H_2}=\dfrac{\dfrac{50}{73}.3}{6}=\dfrac{25}{73}mol\\ V_{H_2}=\dfrac{25}{73}.22,4=\dfrac{560}{73}l\)
a: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
b: \(n_{HCl}=\dfrac{25}{36.5}=\dfrac{50}{73}\left(mol\right)\)
\(\Leftrightarrow n_{AlCl_3}=\dfrac{150}{73}\left(mol\right)=n_{Al}\)
\(m_{Al}=\dfrac{150}{73}\cdot27=\dfrac{4050}{73}\left(g\right)\)
\(n_{Zn}=\dfrac{32,5}{65}=0,5(mol)\\ a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{H_2}=n_{Zn}=0,5(mol)\\ \Rightarrow V_{H_2(phản ứng)}=0,5.22,4=11,2(l)\\ \Rightarrow V_{H_2(thực tế)}=11,2.80\%=8,96(l)\)
\(a/Fe+2HCl\xrightarrow[]{}FeCl_2+H_2\\ b/n_{H_2}=n_{FeCl_2}=0,1mol\\ m_{FeCl_2}=0,1.127=12,7\left(g\right)\\ c/V_{H_2}=0,1.22,4=2,24\left(l\right)\\ d/n_{HCl}=0,1.2=0,2\left(mol\right)\\ V_{HCl\left(pư\right)}=\dfrac{0,2}{2}=0,1\left(l\right)\)
\(c,V_{H_2}=0,1.22,4=2,24\left(l\right)\)
Còn lại giống câu dưới nha
\(a)\\ Fe + 2HCl \to FeCl_2 + H_2\)
b)
\(n_{Fe} = \dfrac{22,4}{56}= 0,4(mol)\\ n_{H_2} = \dfrac{6,72}{22,4} = 0,3(mol)\)
Ta thấy : \(n_{Fe} > n_{H_2}\) nên Fe dư.
Theo PTHH :
\(n_{Fe\ pư} = n_{H_2} = 0,3(mol)\\ \Rightarrow m_{Fe\ pư} = 0,3.56 = 16,8(gam)\)
c)
Ta có :
\(n_{FeCl_2} = n_{H_2} = 0,3(mol)\\ \Rightarrow m_{FeCl_2} = 0,3.127 = 38,1(gam)\)
a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{H_2}=\dfrac{22,4}{22,4}=1\left(mol\right)=>m_{H_2}=1.2=2\left(g\right)\)
Theo ĐLBTKL:
\(m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\)
=> \(m_{HCl}=136+2-65=73\left(g\right)\)
\(a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,m_{H_2}=\dfrac{22,4}{22,4}.2=2(g)\\ BTKL:m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ \Rightarrow m_{HCl}=136+2-65=73(g)\)