Theo gt:mhhKL=mCu+mFe=26,4(1)
mà mCu=1,2mFe(2)
Giải PT(1);(2)=>\(\left\{{}\begin{matrix}m_{Cu}=14,4\left(g\right)\\m_{Fe}=12\left(g\right)\end{matrix}\right.\)
=>nCu=14,4:64=0,225(mol)
=>nFe=12:56=\(\dfrac{3}{14}\)(mol)
a)Ta có PTHH:
Fe2O3+3H2\(\underrightarrow{to}\)2Fe+3H2O(1)
\(\dfrac{3}{28}\).......\(\dfrac{9}{28}\).....\(\dfrac{3}{14}\)...............(mol)
CuO + H2\(\underrightarrow{to}\) Cu+H2O(2)
0,225.....0,225....0,225............(mol)
Theo PTHH(1);(2):\(n_{H_2}\)=\(\dfrac{9}{28}\)+0,225=\(\dfrac{153}{280}\)(mol)
=>\(V_{H_2\left(đktc\right)}\)=\(\dfrac{153}{280}\).22,4=12,24(l)
c)Theo PTHH(1);(2):\(m_{Fe_2O_3}\)=\(\dfrac{3}{28}\).160=17,143(g)
mCuO=0,225.80=18(g)
Theo gt: \(m_{Cu}+m_{Fe}=26,4\)(1)
mà \(m_{Cu}=1,2m_{Fe}\) (2)
(1)(2) \(\Rightarrow m_{Fe}=12\left(g\right)\)
\(\Rightarrow m_{Cu}=26,4-12=14,4\left(g\right)\)
\(n_{Fe}=\dfrac{12}{56}=\dfrac{3}{14}\left(mol\right)\)
\(n_{Cu}=\dfrac{14,4}{64}=0,225\left(mol\right)\)
Pt: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
3/28\(\leftarrow\) 9/28 \(\leftarrow\) 3/14
Pt: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,225\(\leftarrow\) 0,225 \(\leftarrow\) 0,225
\(\Sigma_{n_{H_2}}=\dfrac{9}{28}+0,225=\dfrac{153}{280}\left(mol\right)\)
\(V_{H_2}=\dfrac{153}{280}.22,4=12,14\left(l\right)\)
b) \(m_{Fe_2O_3}=\dfrac{3}{28}.160=17,14\left(g\right)\)
\(m_{CuO}=0,225.80=18\left(g\right)\)
Cách 2:
Gọi x,y lần lượt là số mol của Fe ; Cu
Pt: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\) (1)
3/28 \(\leftarrow\) 9/28 \(\leftarrow\) 3/14
Pt: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\) (2)
9/20 \(\leftarrow\)9/20 \(\leftarrow\) 9/20
(1)(2) \(\Rightarrow\left\{{}\begin{matrix}56x+64y=26,4\\64y=1,2.56x\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{3}{14}\\y=\dfrac{9}{40}\end{matrix}\right.\)
\(\Sigma_{n_{H_2}}=\dfrac{9}{28}+\dfrac{9}{40}=\dfrac{153}{280}\left(mol\right)\)
\(V_{H_2}=\dfrac{153}{280}.22,4=12,14\left(l\right)\)
b) \(m_{Fe_2O_3}=\dfrac{3}{28}.160=17,14\left(g\right)\)
\(m_{CuO}=0,225.80=18\left(g\right)\)
