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\(2NaOH\left(0,2\right)+H_2SO_4\left(0,1\right)\rightarrow Na_2SO_4+2H_2O\)
\(Fe\left(0,2\right)+H_2SO_4\left(0,2\right)\rightarrow FeSO_4+H_2\left(0,2\right)\)
\(n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4}=0,1+0,2=0,3\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)
b/ Thể tích H2 là: \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
\(a.n_{NaOH}=\dfrac{8}{40}=0,2mol\\ 2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,1mol\\ n_{Fe}=\dfrac{11,2}{56}=0,2mol\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ n_{H_2SO_4}=n_{H_2}=n_{Fe}=0,2mol\\ m=m_{H_2SO_4}=\left(0,1+0,2\right).98=29,4g\\ b.V_{H_2}=0,2.24,79=4,958l\)
Bài 1:
\(PTHH:2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ n_{NaOH}=\dfrac{6}{40}=0,15\left(mol\right)\\ \Rightarrow n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}\cdot0,15=0,075\left(mol\right)\\ \Rightarrow m=m_{H_2SO_4}=0,075\cdot98=7,35\left(g\right)\\ n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ \Rightarrow n_{H_2}=0,2\left(mol\right)\\ \Rightarrow V=V_{H_2}=0,2\cdot22,4=4,48\left(l\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
Ta có: \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2SO_4}=0,15\left(mol\right)=n_{H_2}\\n_{Al_2\left(SO_4\right)_3}=0,05\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\\m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\\V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\end{matrix}\right.\)
a) \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
______0,1--->0,15-------->0,05------->0,15
=> mH2SO4 = 0,15.98 = 14,7 (g)
b) VH2 = 0,15.22,4 = 3,36 (l)
c) mAl2(SO4)3 = 0,05.342 = 17,1 (g)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2.......0.4......0.2...........0.2\)
\(m_{FeCl_2}=0.2\cdot127=25.4\left(g\right)\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
\(0.4............0.4\)
\(m_{NaOH\left(dư\right)}=\left(0.8-0.4\right)\cdot40=16\left(g\right)\)
\(a)\ n_{Fe} = \dfrac{11,2}{56} = 0,2(mol)\\ Fe + 2HCl \to FeCl_2 + H_2\\ n_{FeCl_2} = n_{Fe} = 0,2(mol)\\ \Rightarrow m_{FeCl_2} = 0,2.127 = 25,4\ gam\\ b) n_{H_2} = n_{Fe} = 0,2(mol)\Rightarrow V_{H_2} = 0,2.22,4 = 4,48(lít)\\ c) n_{HCl} = 2n_{Fe} = 0,4(mol)\\ NaOH + HCl \to NaCl + H_2O\\ n_{NaOH} = 0,8> n_{HCl} = 4 \Rightarrow NaOH\ dư\\ n_{NaOH\ pư} = n_{HCl} = 0,4(mol)\\ \Rightarrow m_{NaOH\ dư} = (0,8-0,4).40 = 16\ gam\)
\(m_{H_2SO_4}=\dfrac{150.20}{100}=30\left(g\right)\)
a, \(n_{H_2SO_4}=\dfrac{30}{98}=\dfrac{15}{49}\left(mol\right)\)
PTHH :
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)
15/49 15/49 15/49
\(b,V_{H_2}=n.22,4=\dfrac{15}{49}.22,4=\dfrac{48}{7}\approx6.86\left(l\right)\)
\(c,m_{FeSO_4}=\dfrac{15}{49}.152\approx46,53\left(g\right)\)
Tên gọi : Sắt (II) Sunfat
\(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{FeCl_2}=n_{Fe}=0,4\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ b,m_{FeCl_2}=127.0,4=50,8\left(g\right)\)
Bài 1 nhé
Bài 2:
\(n_{NaOH}=\dfrac{12}{40}=0,3\left(mol\right)\\ 2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ n_{H_2SO_4}=n_{Na_2SO_4}=\dfrac{0,3}{2}=0,15\left(mol\right);n_{H_2O}=n_{NaOH}=0,3\left(mol\right)\\ C1:m_{sp}=m_{Na_2SO_4}+m_{H_2O}=142.0,15+0,3.18=26,7\left(g\right)\\ C2:m_{H_2SO_4}=0,15.98=14,7\left(g\right)\\ \Rightarrow m_{sp}=m_{tg}=m_{NaOH}+m_{H_2SO_4}=12=14,7=26,7\left(g\right)\)
a, PTHH : \(Cl_2+Cu\rightarrow CuCl_2\)
\(n_{Cl_2}=\dfrac{V}{22.4}=\dfrac{10,8}{22,4}=0,48\left(mol\right)\)
\(n_{CuCl_2}=\dfrac{m}{M}=\dfrac{63,9}{135}=0,47\left(mol\right)\)
PTHH : \(Cl_2+Cu\rightarrow CuCl_2\)
TheoPTHH : 1 mol → 1mol
Theo baì : 0,48 mol → 0,47 mol
Tỉ lệ : \(\dfrac{0,48}{1}>\dfrac{0,47}{1}\)
=> Cl2 dư , \(CuCl_2\) hết
\(n_{NaOH}=\dfrac{8}{40}=0,2mol\); \(n_{Fe}=\dfrac{11,2}{56}=0,2mol\)
2NaOH+H2SO4\(\rightarrow\)Na2SO4+2H2O
Fe+H2SO4\(\rightarrow\)FeSO4+H2
\(n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}+n_{Fe}=\dfrac{1}{2}.0,2+0,2=0,3mol\)
m=\(0,3.98=29,4gam\)
\(n_{H_2}=n_{Fe}=0,2mol\rightarrow V_{H_2}=0,2.22,4=4,48l\)