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\(a,n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\)
\(PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ \Rightarrow n_{H_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,03\cdot22,4=0,672\left(l\right)\\ b,n_{HCl}=2n_{Fe}=0,06\left(mol\right)\\ \Rightarrow m_{HCl}=0,06\cdot36,5=2,19\left(g\right)\\ c,n_{FeCl_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow m_{FeCl_2}=0,03\cdot127=3,81\left(g\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\\ a.n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\\ n_{H_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow V_{H_2}=0,03.22,4=0,672\left(l\right)\\ b.n_{HCl}=2n_{Fe}=0,06\left(mol\right)\\ m_{HCl}=0,06.36,5=2,19\left(g\right)\\ c.n_{FeCl_2}=n_{Fe}=0,03\left(mol\right)\\ m_{FeCl_2}=0,03.127=3,81\left(g\right)\)
pứ: Fe + 2HCl -> FeCl2 + H2
b. nFe = \(\dfrac{5,6}{56}\)= 0,1 mol
Từ pt suy ra được: nHCl = 2.nFe= 0,2 mol
=> mHCl = 0,2. 36,5 = 7,3 g
c. nH2 = nFe = 0,1 mol
=> VH2 = 0,1.22,4 = 2,24 (lít)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
a) PTHH: Fe + 2HCl --> FeCl2 + H2
_______0,2---->0,4----->0,2--->0,2
=> VH2 = 0,2.22,4 = 4,48(l)
b) mHCl = 0,4.36,5 = 14,6(g)
c) mFeCl2 = 0,2.127 = 25,4 (g)
a)
$Fe + 2HCl \to FeCl_2 + H_2$
$n_{Fe} = n_{H_2} = \dfrac{3,36}{22,4} = 0,15(mol)$
$m_{Fe} = 0,15.56 = 8,4(gam)$
b) $n_{HCl} = 2n_{H_2} = 0,3(mol)$
$\Rightarrow m_{HCl} = 0,3.36,5 = 10,95(gam)$
c)
Cách 1 : $n_{FeCl_2} = n_{H_2} = 0,15(mol) \Rightarrow m_{FeCl_2} = 0,15.127 = 19,05(gam)$
Cách 2 : Bảo toàn khối lượng, $m_{FeCl_2} = 8,4 + 10,95 - 0,15.2 = 19,05(gam)$
. Biết có 2,4.1022 nguyên tử Al phản ứng.
SO2 . Hãy cho biết:
Câu 1:
\(n_{Fe}=\dfrac{11,2}{56}=0,2(mol)\\ Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{H_2}=n_{FeCl_2}=0,2(mol);n_{HCl}=0,4(mol)\\ a,V_{H_2}=0,2.22,4=4,48(l)\\ b,m_{HCl}=0,4.36,5=14,6(g)\\ c,m_{FeCl_2}=0,2.127=25,4(g)\)
Câu 2:
\(n_{Fe}=\dfrac{1,4}{56}=0,025(mol)\)
Theo PT bài 1: \(n_{HCl}=0,05(mol);n_{H_2}=0,025(mol)\\ a,m_{HCl}=0,05.36,5=1,825(g)\\ b,V_{H_2}=0,025.22,4=0,56(l)\)
Câu 3:
\(4Al+3O_2\xrightarrow{t^o}2Al_2O_3\\ n_{Al}=\dfrac{2,4.10^{22}}{6.10^{23}}=0,04(mol)\\ \Rightarrow n_{O_2}=0,03(mol);n_{Al_2O_3}=0,02(mol)\\ a,V_{O_2}=0,03.22,4=0,672(l)\Rightarrow V_{kk}=0,672.5=3,36(l)\\ b,m_{Al_2O_3}=0,02.102=2,04(g)\)
Câu 4:
\(S+O_2\xrightarrow{t^o}SO_2\\ a,ĐC:S,O_2\\ HC:SO_2\\ b,n_{O_2}=1,5(mol)\\ \Rightarrow V{O_2}=1,5.22,4=33,6(l)\\ c,d_{S/kk}=\dfrac{32}{29}>1\)
Vậy S nặng > kk
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2......0.4..........0.2...........0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(m_{FeCl_2}=0.2\cdot127=25.4\left(g\right)\)
\(PTPU:Fe+2HCl\rightarrow FeCl_2+H_2\)
\(a.n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(\Rightarrow V_{Fe}=0,2.22,4=4,48\left(l\right)\)
\(b.\) ta có: \(n_{HCl}=2\)
\(\Rightarrow n_{Fe}=0,2.2=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(c.n_{FeCl_2}=n_{Fe}=0,2mol\)
\(\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
\(n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ 0,03....0,06.....0,03.......0,03\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,03.22,4=0,672\left(l\right)\\ b,m_{HCl}=0,06.36,5=2,19\left(g\right)\\ c,m_{FeCl_2}=127.0,03=3,81\left(g\right)\)