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\(n_{HCl}=n_{H2SO4}=0,5.0,2=0,1(mol)\\ m_{HCl}=0,1.36,5=3,65g\\ m_{H_2SO_4}=0,1.98=9,8g\\ n_H=0,1+0,1.2=0,3(mol)\\ →n_{H_2O}=\frac{0,3}{2}=0,15(mol)\\ m_{H_2O}=0,15.18=2,7g\\ BTKL:\\ m_{muối}=12+3,65+9,8-2,7=22,75g\\ →B\)
\(n_{HCl}=n_{H2SO4}=0,5.0,2=0,1(mol)\\ m_{HCl}=0,1.36,5=3,65(g)\\ m_{H2SO4}=0,1.98=9,8(g)\\ BTKL:\\ m_{muối}=12+3,65+9,8=25,45g\\ \to A\)
\(n_{FeO}=\dfrac{14,4}{72}=0,2\left(mol\right)\\ n_{HCl}=500.10^{-3}.0,2=0,1\left(mol\right)\\ n_{H_2SO_4}=500.10^{-3}.0,3=0,15\left(mol\right)\)
\(PTHH:\\ FeO+2HCl\rightarrow FeCl_2+H_2O\left(1\right)\\ FeO+H_2SO_4\rightarrow FeSO_4+H_2O\left(2\right)\)
Đặt: \(n_{FeO\left(1\right)}=a\left(mol\right);n_{FeO\left(2\right)}=b\left(mol\right)\)
Ta có hệ phương trình:\(\left\{{}\begin{matrix}a+b=0,2\\2a+b=0,1+0,15\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,05\\b=0,15\end{matrix}\right.\)
\(m=0,05.127+0,15.152=29,15\left(g\right)\)
Ta có: \(\left\{{}\begin{matrix}n_{HCl}=0,5.0,2=0,1\left(mol\right)\\n_{H_2SO_4}=0,5.0,3=0,15\left(mol\right)\end{matrix}\right.\)
\(n_{FeO}=\dfrac{14,4}{72}=0,2\left(mol\right)\)
PT: \(FeO+2HCl\rightarrow FeCl_2+H_2O\)
____0,05___0,1______0,05 (mol)
\(FeO+H_2SO_4\rightarrow FeSO_4+H_2O\)
0,15____0,15______0,15 (mol)
⇒ m muối = mFeCl2 + mFeSO4 = 0,05.127 + 0,15.152 = 29,15 (g)
→ Đáp án: B
Bạn tham khảo nhé!
\(a,\) Đặt \(n_{Al}=x(mol);n_{Fe}=y(mol)\)
\(\Rightarrow 27x+56y=11(1)\\ 2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ Fe+H_2SO_4\to FeSO_4+H_2\\ Al_2(SO_4)_3+6NaOH\to 2Al(OH)_3\downarrow+3Na_2SO_4\\ FeSO_4+2NaOH\to Fe(OH)_2\downarrow+Na_2SO_4\\ \Rightarrow n_{Al(OH)_3}=x;n_{Fe(OH)_2}=y\\ \Rightarrow 78x+90y=24,6(2)\\ (1)(2)\Rightarrow \begin{cases} x=0,2(mol)\\ y=0,1(mol) \end{cases} \Rightarrow \begin{cases} m_{Al}=0,2.27=5,4(g)\\ m_{Fe}=11-5,4=5,6(g) \end{cases}\)
\(b,\Sigma n_{H_2SO_4}=1,5x+y=0,4(mol)\\ \Rightarrow V_{dd_{H_2SO_4}}=\dfrac{0,4}{0,2}=2(l)\\ c,\Sigma n_{NaOH}=3x+2y=0,8(mol)\\ \Rightarrow m_{dd_{NaOH}}=\dfrac{0,8.40}{10\%}=320(g)\\ d,2Al(OH)_3\xrightarrow{t^o}Al_2O_3+3H_2O\\ Fe(OH)_2\xrightarrow{t^o}FeO+H_2O\\ \Rightarrow n_{Al_2O_3}=0,1(mol);n_{FeO}=0,1(mol)\\ \Rightarrow m_{\text{chất rắn}}=0,1.102+0,1.72=17,4(g)\)
\(n_{H^+}=0,07mol=n_{OH^-}\)=>\(v=\dfrac{0,07}{0,2+0,1.2}=0,175l\)
- Ta có : \(m_{hh}=m_{Na}+m_{Ba}=7,09=23n_{Na}+137n_{Ba}\left(I\right)\)
\(2Na+2H_2O\rightarrow2NaOH+H_2\)
\(Ba+2H_2O\rightarrow Ba\left(OH\right)_2+H_2\)
- Theo PTHH : \(n_{H_2}=\dfrac{V}{22,4}=0,075=\dfrac{1}{2}n_{Na}+n_{Ba}\left(II\right)\)
- Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{Na}=0,07\\n_{Ba}=0,04\end{matrix}\right.\) mol .\(\Rightarrow\left\{{}\begin{matrix}n_{NaOH}=0,07\\n_{Ba\left(OH\right)_2}=0,04\end{matrix}\right.\) mol .
\(\Rightarrow n_{OH^-}=0,15mol\)
Theo bài ra : \(n_{H^+}=0,2V+2.0,15.V=0,5Vmol\)
PT : \(H^++OH^-\rightarrow H_2O\)
Theo PT ion : \(0,5V=0,15\)
\(\Rightarrow V=0,3\left(l\right)\)
- Ta lại có : \(\left\{{}\begin{matrix}n_{Ba\left(OH\right)2}=0,04\\n_{H2SO4}=0,045\end{matrix}\right.\) mol
\(PTHH:Ba\left(OH\right)_2+H_2SO_4\rightarrow BaSO_4+2H_2O\)
Theo PTHH : \(m_{\downarrow}=m_{BaSO4}=0,04.M=9,32\left(g\right)\)
Vậy ...
500ml = 0,5l
\(n_{HCl}=0,2.0,5=0,1\left(mol\right)\)
a) Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,05 0,1 0,05 0,05
b) \(n_{Fe}=\dfrac{0,1.1}{2}=0,05\left(mol\right)\)
⇒ \(m_{Fe}=0,05.56=2,8\left(g\right)\)
c) \(n_{H2}=\dfrac{0,1.1}{2}=0,05\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)
d) \(n_{FeCl2}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)
⇒ \(m_{FeCl2}=0,05.127=6,35\left(g\right)\)
Chúc bạn học tốt
\(n_{HCl}=n_{H2SO4}=0,5.0,2=0,1(mol)\\ m_{HCl}=0,1.36,5=3,65(g)\\ m_{H2SO4}=0,1.98=9,8(g)\\ BTKL:\\ m_{muối}=12+3,65+9,8=25,45g\\ \to A\)
\(n_{HCl}=n_{H2SO4}=0,5.0,2=0,1(mol)\\ m_{HCl}=0,1.36,5=3,65g\\ m_{H_2SO_4}=0,1.98=9,8g\\ n_H=0,1+0,1.2=0,3(mol)\\ →n_{H_2O}=\frac{0,3}{2}=0,15(mol)\\ m_{H_2O}=0,15.18=2,7g\\ BTKL:\\ m_{muối}=12+3,65+9,8-2,7=22,75g\\ →B\)