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\(Fe_3O_4+4CO-t^o->3Fe+4CO_2\)
Áp dụng ĐLBTKL, ta có: \(m_{Fe_3O_4}+m_{CO}=16,8+17,6=34,4\left(g\right)\)
Đặt khối lượng khí Cacbon Oxit đã dùng là a gam: \(m_{CO}=a\left(g\right)\)
\(\Rightarrow m_{Fe_3O_4}=\dfrac{29}{14}a\left(g\right)\)
Ta có: \(\dfrac{29}{14}a+a=34,4\)
\(\Rightarrow a=11,2\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CO}=11,2\left(g\right)\\m_{Fe_3O_4}=23,2\left(g\right)\end{matrix}\right.\)
TL:
Tham khảo nhé:
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@tuantuthan
HT
a, \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b, \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=0,2\left(mol\right)\Rightarrow V_{O_2}=0,2.22,4=4,48\left(l\right)\)
\(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=0,1\left(mol\right)\Rightarrow m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
c, \(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\), ta được H2 dư.
Theo PT: \(n_{Cu}=n_{CuO}=0,2\left(mol\right)\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)
a) Chất tham gia: Sắt (Fe), Oxi (O2)
Sản phẩm: Sắt từ (Fe3O4)
b) Theo ĐLBTKL
\(m_{Fe}+m_{O_2}=m_{Fe_3O_4}\) (1)
c) \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\); \(n_{Fe_3O_4}=\dfrac{46,4}{232}=0,2\left(mol\right)\)
PTHH: 3Fe + 2O2 --to--> Fe3O4
______0,2----------------->\(\dfrac{0,2}{3}\) ________(mol)
=> vô lí ...
\(a,n_{CaCO_3}=\dfrac{200}{100}=2\left(mol\right)\\ Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\)
2 2
\(Fe_2O_3+3CO\underrightarrow{t^o}2Fe+3CO_2\)
\(\dfrac{1}{6}\) 2 \(\dfrac{2}{3}\) 2
\(n_{Fe\left(thu.được\right)}=\dfrac{266}{56}=4,75\left(mol\right)\)
\(\rightarrow n_{Fe\left(H_2\right)}=4,75-\dfrac{2}{3}=\dfrac{49}{12}\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
\(\dfrac{49}{24}\) 6,125 \(\dfrac{49}{12}\)
\(\rightarrow\left\{{}\begin{matrix}V_{CO}=2.22,4=44,8\left(l\right)\\V_{H_2}=6,125.22,4=137,2\left(l\right)\\m_{Fe_2O_3}=\left(\dfrac{1}{6}+\dfrac{49}{24}\right).160=\dfrac{1060}{3}\left(g\right)\end{matrix}\right.\)
\(PTHH:3Fe+2O_2\xrightarrow{t^o}Fe_3O_4\\ BTKL:m_{O_2}=m_{Fe_3O_4}-m_{Fe}=23,2-16,8=6,4(g)\)
\(a/3Fe+2O_2\xrightarrow[]{t^0}Fe_3O_4\\ b/n_{Fe}=\dfrac{1,4}{56}=0,025mol\\ n_{O_2}=\dfrac{0,025.2}{3}=\dfrac{0,05}{3}mol\\ V_{O_2}=\dfrac{0,05}{3}\cdot22,4\approx0,37l\\ c/C_1\\ n_{Fe_3O_4}=\dfrac{0,025}{3}mol\\ m_{Fe_3O_4}=\dfrac{0,025}{3}\cdot232\approx1,93g\\ C_2\\ m_{O_2}=\dfrac{0,05}{3}\cdot32\approx0,53g\\ BTKL:m_{Fe}+m_{O_2}=m_{Fe_3O_4}\\ \Rightarrow m_{Fe_3O_4}=1,4+0,53=1,93g\)
