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\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2......0.4..........0.2...........0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(m_{FeCl_2}=0.2\cdot127=25.4\left(g\right)\)
\(PTPU:Fe+2HCl\rightarrow FeCl_2+H_2\)
\(a.n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(\Rightarrow V_{Fe}=0,2.22,4=4,48\left(l\right)\)
\(b.\) ta có: \(n_{HCl}=2\)
\(\Rightarrow n_{Fe}=0,2.2=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(c.n_{FeCl_2}=n_{Fe}=0,2mol\)
\(\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
. 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
\(PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\)
________0,2____0,4______ 0,2_____0,2
a, Ta có:
\(n_{Fe}=\frac{11,2}{56}=0,2\left(mol\right)\)
\(\Rightarrow V_{H2}=0,2.22,4=4,48\left(l\right)\)
b,
\(m_{HCl}=0,4.\left(1+35,5\right)=14,6\left(g\right)\)
c,
\(m_{FeCl2}=0,2.\left(56+35,5.2\right)=25,4\left(g\right)\)
Fe+2HCl---------> FeCl2 + H2
\(n_{Fe}=\frac{11,2}{56}=0,2\left(mol\right)\)
a) Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\)
=> V H2 = 0,2. 22,4 = 4,48(l)
b) Theo PT: \(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\)
=> m HCl = 0,4. 36,5 = 14,6 (g)
c) Theo PT: \(n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)
=> m FeCl2 = 0,2. 127 = 25,4 (g)
Câu 1:
PTHH: Fe + 2HCl ===> FeCl2 + H2
a/ nFe = 11,2 / 56 = 0,2 mol
=> nH2 = 0,2 mol
=> VH2(đktc) = 0,2 x 22,4 = 4,48 lít
b/ => nHCl = 0,2 x 2 = 0,4 mol
=> mHCl = 0,4 x 36,5 = 14,6 gam
c/ => nFeCl2 = 0,2 mol
=> mFeCl2 = 0,2 x 127 = 25,4 gam
Câu 3/
a/ Chất tham gia: S, O2
Chất tạo thành: SO2
Đơn chất: S, O2 vì những chất này chỉ do 1 nguyên tố tạo nên
Hợp chất: SO2 vì chất này do 2 nguyên tố S và O tạo tên
b/ PTHH: S + O2 =(nhiệt)==> SO2
=> nO2 = 1,5 mol
=> VO2(đktc) = 1,5 x 22,4 = 33,6 lít
c/ Khí sunfuro nặng hơn không khí
\(Fe+2HCl-->FeCl_2+H_2\)
0,2___0,4__________0,2____0,2
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
a) => \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b)=> \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
c) \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
Fe + 2HCl → FeCl2 + H2
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
a) Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2\times22,4=4,48\left(l\right)\)
b) Theo PT: \(n_{HCl}=2n_{Fe}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4\times36,5=14,6\left(g\right)\)
c) Theo PT: \(n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=0,2\times127=25,4\left(g\right)\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
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)
\(a,n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\)
\(PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ \Rightarrow n_{H_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,03\cdot22,4=0,672\left(l\right)\\ b,n_{HCl}=2n_{Fe}=0,06\left(mol\right)\\ \Rightarrow m_{HCl}=0,06\cdot36,5=2,19\left(g\right)\\ c,n_{FeCl_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow m_{FeCl_2}=0,03\cdot127=3,81\left(g\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\\ a.n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\\ n_{H_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow V_{H_2}=0,03.22,4=0,672\left(l\right)\\ b.n_{HCl}=2n_{Fe}=0,06\left(mol\right)\\ m_{HCl}=0,06.36,5=2,19\left(g\right)\\ c.n_{FeCl_2}=n_{Fe}=0,03\left(mol\right)\\ m_{FeCl_2}=0,03.127=3,81\left(g\right)\)
\(n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ 0,03....0,06.....0,03.......0,03\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,03.22,4=0,672\left(l\right)\\ b,m_{HCl}=0,06.36,5=2,19\left(g\right)\\ c,m_{FeCl_2}=127.0,03=3,81\left(g\right)\)
\(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\dfrac{8,4}{56}=0,15mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,15 0,3 0,15 0,15 ( mol )
\(V_{H_2}=n_{H_2}.22,4=0,15.22,4=3,36l\)
\(m_{HCl}=n_{HCl}.M_{HCl}=0,3.36,5=10,95g\)
\(m_{FeCl_2}=n_{FeCl_2}.M_{FeCl_2}=0,15.127=19,05g\)
a) \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
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)