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PTHH: \(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2O\)
Ta có: \(n_{Fe}=\dfrac{21}{56}=0,375\left(mol\right)\)
\(\Rightarrow n_{Fe_2O_3}=0,1875\left(mol\right)\) \(\Rightarrow m_{Fe_2O_3}=0,1875\cdot160=30\left(g\right)\)
$a)n_{Fe}=\dfrac{42}{56}=0,75(mol)$
$Fe_2O_3+3H_2\xrightarrow{t^o}2Fe+3H_2O$
$\Rightarrow n_{Fe_2O_3}=0,5n_{Fe}=0,375(mol)$
$\Rightarrow m_{Fe_2O_3}=0,375.160=60(g)$
$b)n_{H_2O}=1,5n_{Fe}=1,125(mol)$
$\Rightarrow m_{H_2O}=1,125.18=20,25(g)$
3H2+Fe2O3->2Fe+3H2O
a)nFe=0.75(mol)
nFe2O3=0.375(mol)
mFe2O3=60(g)
b)nH2O=1.125(mol)
mH2O=20.25(g)
a. Công thức về khối lượng:
\(m_{Fe_2O_3}+m_{H_2}=m_{Fe}+m_{H_2O}\)
b. Áp dụng câu a, ta có:
\(m_{Fe_2O_3}+2=56+18\)
\(\Leftrightarrow m_{Fe_2O_3}=56+18-2\)
\(\Leftrightarrow m_{Fe_2O_3}=72\left(g\right)\)
\(a)3H_2+Fe_2O_3-^{t^o}\rightarrow2Fe+3H_2O\\b)BTKL:m_{H_2}+m_{Fe_2O_3}=m_{Fe}+m_{H_2O}\\ \Leftrightarrow2+m_{Fe_2O_3}=56+18 \\ \Rightarrow m_{Fe_2O_3}=72\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\\ PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\ Mol:0,2\rightarrow0,6\rightarrow0,4\\ \rightarrow\left\{{}\begin{matrix}m_{Fe}=0,4.56=22,4\left(g\right)\\V_{H_2}=0,6.22,4=13,44\left(l\right)\end{matrix}\right.\)
\(n_{O_2}=\dfrac{6,4}{32}=0,2\left(mol\right)\\ PTHH:2H_2+O_2\underrightarrow{t^o}2H_2O\\ LTL:\dfrac{0,6}{2}>0,2\rightarrow O_2.dư\\ n_{H_2\left(Pư\right)}=0,2.2=0,4\left(mol\right)\\ \rightarrow m_{H_2\left(dư\right)}=\left(0,6-0,4\right).2=0,4\left(g\right)\)
\(Fe_2O_3+3CO\xrightarrow{t^o}2Fe+3CO_2\uparrow\\ n_{Fe}=\dfrac{1,12}{56}=0,02(mol)\\ \Rightarrow n_{CO}=0,03(mol)\\ \Rightarrow V_{CO}=0,03.22,4=0,672(l)=672(ml)\)
ta có nCO2=\(\frac{13.44}{22.4}\)=0,6 mol
bt1) Fe2O3+ CO\(\rightarrow\) CO2+Fe
ta có nFe= 0,6 mol
vậy mFe=0,6.56=33,6
\(n_{Fe_2O_3}=\dfrac{32}{160}=0.2\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{^{^{t^o}}}2Fe+3H_2O\)
\(0.2........0.6........0.4........0.6\)
\(V_{H_2}=0.6\cdot22.4=13.44\left(l\right)\)
\(m_{Fe}=0.4\cdot56=22.4\left(g\right)\)
Số phân tử H2O là : \(0.6\cdot6\cdot10^{23}=3.6\cdot10^{23}\left(pt\right)\)
\(a,Fe_2O_3+3H_2\to2Fe+3H_2O\\ b,n_{Fe}=\dfrac{21}{56}=0,375(mol)\\ \Rightarrow n_{Fe_2O_3}=0,1875(mol)\\ \Rightarrow m_{Fe_2O_3}=0,1875.160=30(g)\)