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a) Fe+H2SO4------>FeSO4+H2
b)nH2=5,6/22,4=0,25mol
Fe+H2SO4------->FeSO4+H2
0,25 <---- 0,25
Theo pt:
nFe=0,25mol
=>mFe=0,25×56=14g
c)
Fe+H2SO4------->FeSO4+H2
0,25 <---- 0,25
Theo pt:
nH2SO4=0,25 mol
CM=n/V=0,25/0,05=5(M)
\(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
0,25 .... 0,25 ...... 0,25 ..... 0,25 (mol)
a. \(m_{Fe}pư=0,25.56=14\left(g\right)\)
b. \(C_M\left(H_2SO_4\right)=C_M\left(FeSO_4\right)=\dfrac{0,25}{0,05}=5\left(M\right)\)
\(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
\(n_{O2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Pt : \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4|\)
3 2 1
0,3 0,15 0,075
Lập tỉ số so sánh : \(\dfrac{0,3}{3}>\dfrac{0,15}{2}\)
⇒ Fe dư , O2 phản ứng hết
⇒ Tính toán dựa vào số mol của O2
\(n_{Fe3O4}=\dfrac{0,15.1}{2}=0,075\left(mol\right)\)
⇒ \(m_{Fe3O4}=0,075.232=17,4\left(g\right)\)
\(n_{Fe\left(dư\right)}=0,3-\left(\dfrac{0,15.3}{2}\right)=0,075\left(mol\right)\)
⇒ \(m_{Fe\left(dư\right)}=0,075.56=4,2\left(g\right)\)
Chúc bạn học tốt
PTHH: \(C+O_2\xrightarrow[]{t^o}CO_2\)
Ta có: \(\left\{{}\begin{matrix}n_C=\dfrac{2,4}{12}=0,2\left(mol\right)\\n_{O_2}=\dfrac{36}{32}=1,125\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Oxi còn dư
\(\Rightarrow\left\{{}\begin{matrix}n_{CO_2}=0,2\left(mol\right)\\n_{O_2\left(dư\right)}=0,925\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CO_2}=0,2\cdot44=8,8\left(g\right)\\V_{khí}=V_{O_2\left(dư\right)}+V_{CO_2}=\left(0,2+0,925\right)\cdot22,4=25,2\left(l\right)\end{matrix}\right.\)
\(n_{Fe}=\dfrac{6,8}{56}=0,12mol\)
3Fe + 2O2 \(\underrightarrow{t^o}\) Fe3O4
0,12 0,08 0,04 ( mol )
a, \(V_{O_2}=0,08.22,4=1,792l\)
b, mFe3O4 = 0,04.232 = 9,28g
\(n_{Fe}=\dfrac{6,8}{56}=\dfrac{17}{140}(mol)\\ PTHH:3Fe+2O_2\xrightarrow{t^o}Fe_3O_4\\ a,n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{17}{210}(mol)\\ \Rightarrow V_{O_2}=\dfrac{17}{210}.22,4=1,81(g)\\ b,n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{17}{420}(mol)\\ \Rightarrow m_{Fe_3O_4}=\dfrac{17}{420}.232=9,39(g)\)
TL:
Tham khảo nhé:
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@tuantuthan
HT
\(n_{H_2}\)=\(\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH 2H2 +O2----to--->2H2O
0,2....0,1.................0,2
=>\(m_{H_2O}=0,2.18=3,6\left(g\right)\)
=>\(V_{O_2}=0,1.22,4=2,24\left(l\right)\)
=>Vkk=2,24.5=11,2(l)
\(n_{H_2} = \dfrac{4,48}{22,4} = 0,2(mol)\\ 2H_2 + O_2 \xrightarrow{t^o} 2H_2O\\ n_{H_2O} = n_{H_2} =0,2(mol) \Rightarrow m_{H_2O} = 0,2.18 = 3,6(gam)\\ n_{O_2} = \dfrac{1}{2}n_{H_2} = 0,1(mol)\\ \Rightarrow V_{O_2} = 0,1.22,4 = 2,24(lít)\\ \Rightarrow V_{không\ khí} = 5V_{O_2} = 2,24.5 = 11,2(lít) \)
\(3Fe+2O_2\rightarrow Fe_3O_4\)
\(m_{Fe_3O_4}=12+23.2=35.2\left(g\right)\)
nO2 = 8.96/22.4 =0.4 mol
nFe = 11.2 : 56 = 0.2 mol
PTHH: 3Fe + 2O2 -----> Fe2O3
Theo PT: 3 - 2 -1 (mol)
BC: 0.2 - 0.4 (mol)
Ta có: \(\dfrac{3}{0.2}\)>\(\dfrac{2}{0.4}\)
Suy ra: số mol của Fe dư
a) \(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: \(4P+5O_2\xrightarrow[]{t^o}2P_2O_5\)
0,08<--0,1---->0,04
`=> m_{P} = 0,08.31 = 2,48 (g)`
b) `m_{P_2O_5} = 0,04.142 = 5,68 (g)`
c) \(2KMnO_4\xrightarrow[]{t^o}K_2MnO_4+MnO_2+O_2\)
0,2<-------------------------------------0,1
`=> m_{KMnO_4} = 0,2.158 = 31,6 (g)`
Ta có: \(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
a, PT \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(n_P=\dfrac{4}{5}n_{O_2}=0,08\left(mol\right)\Rightarrow m_P=0,08.31=2,48\left(g\right)\)
b, \(n_{P_2O_5}=\dfrac{2}{5}n_{O_2}=0,04\left(mol\right)\Rightarrow m_{P_2O_5}=0,04.142=5,68\left(g\right)\)
c, \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
\(n_{KMnO_4}=2n_{O_2}=0,2\left(mol\right)\Rightarrow m_{KMnO_4}=0,2.158=31,6\left(g\right)\)
nO2 = 1,12/22,4 = 0,05 (mol)
PTHH: 3Fe + 2O2 -> (t°) Fe3O4
Mol: 0,075 <--- 0,05 ---> 0,025
mFe = 0,075 . 56 = 4,2 (g)
mFe3O4 = 0,025 . 232 = 5,8 (g)
3Fe+2O2-to>Fe3O4
0,075-0,05------0,025 mol
n O2=\(\dfrac{1,12}{22,4}\)=0,05 mol
=>m Fe=0,075.56=4,2g
=>m Fe3O4=0,025.232=5,8g