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a)
\(n_{Al} = \dfrac{0,54}{27} = 0,02(mol) \\n_{H_2SO_4} = 0,1.0,5 = 0,05(mol) \)
PTHH : \(2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2\)
Theo PTHH , ta thấy :
\(n_{Al}.\dfrac{3}{2} = 0,03(mol) < n_{H_2SO_4}\) nên H2SO4 dư.
Ta có : \(n_{H_2} = \dfrac{3}{2}n_{Fe} = 0,03(mol)\\ V_{H_2} = 0,03.22,4 = 0,672(lít)\)
b)
Ta có :
\(n_{H_2SO_4\ pư} = \dfrac{3}{2}n_{Al} = 0,03(mol)\\ n_{H_2SO_4\ dư} = 0,05 - 0,03 = 0,02(mol)\\ n_{Al_2(SO_4)_3} = 0,5n_{Al} = 0,01(mol)\)
Vậy :
\(C_{M_{H_2SO_4}} = \dfrac{0,02}{0,1} = 0,2M\\ C_{M_{Al_2(SO_4)_3}} = \dfrac{0,01}{0,1} = 0,1M\)
PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
a, Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(n_{H_2SO_4}=0,1.0,5=0,05\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,2}{2}>\dfrac{0,05}{3}\) , ta được Al dư.
Theo PT: \(n_{H_2}=n_{H_2SO_4}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,05.22,4=1,12\left(l\right)\)
b, Dung dịch sau pư chỉ gồm Al2(SO4)3.
Theo PT: \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2SO_4}=\dfrac{1}{60}\left(mol\right)\)
\(\Rightarrow C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{\dfrac{1}{60}}{0,1}\approx0,16\left(M\right)\)
Bạn tham khảo nhé!
a, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Theo PT: \(n_{H_2}=n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b, \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
c, \(n_{HCl}=2n_{H_2}=0,4\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,4}{0,3}=\dfrac{4}{3}\left(M\right)\)
\(C_{M_{FeCl_2}}=\dfrac{0,2}{0,3}=\dfrac{2}{3}\left(M\right)\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2(mol)\\ Fe+H_2SO_4\to FeSO_4+H_2\\ \Rightarrow n_{H_2SO_4}=n_{FeSO_4}=n_{H_2}=0,2(mol)\\ a,V_{H_2}=0,2.22,4=4,48(l)\\ b,m_{dd_{H_2SO_4}}=\dfrac{0,2.98}{9,8\%}=200(g)\\ c,C\%_{FeSO_4}=\dfrac{0,2.152}{11,2+200-0,2.2}.100\%=14,42\%\)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(n_{H_2SO_4}=0.2\cdot2=0.4\left(mol\right)\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(1.........1\)
\(0.2..........0.4\)
\(LTL:\dfrac{0.2}{1}< \dfrac{0.4}{1}\Rightarrow H_2SO_4dư\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{H_2SO_4\left(dư\right)}=\left(0.4-0.2\right)\cdot98=19.6\left(g\right)\)
\(C_{M_{FeSO_4}}=\dfrac{0.2}{0.2}=1\left(M\right)\)
a, \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
\(m_{HCl}=200.14,6\%=29,2\left(g\right)\Rightarrow n_{HCl}=\dfrac{29,2}{36,5}=0,8\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Xét tỉ lệ: \(\dfrac{0,3}{1}< \dfrac{0,8}{2}\), ta được HCl dư.
Theo PT: \(n_{H_2}=n_{Zn}=0,3\left(mol\right)\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
b, \(n_{ZnCl_2}=n_{Zn}=0,3\left(mol\right)\Rightarrow m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
c, \(n_{HCl\left(pư\right)}=2n_{Zn}=0,6\left(mol\right)\Rightarrow n_{HCl\left(dư\right)}=0,2\left(mol\right)\)
Ta có: m dd sau pư = 19,5 + 200 - 0,3.2 = 218,9 (g)
\(\Rightarrow\left\{{}\begin{matrix}C\%_{HCl}=\dfrac{0,2.36,5}{218,9}.100\%\approx3,33\%\\C\%_{ZnCl_2}=\dfrac{40,8}{218,9}.100\%\approx18,64\%\end{matrix}\right.\)
\(a)n_{Zn}=\dfrac{19,5}{65}=0,3mol\\ n_{HCl}=\dfrac{200.14,6}{100.36,5}=0,8mol\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ \Rightarrow\dfrac{0,3}{1}< \dfrac{0,8}{2}\Rightarrow HCl.dư\\ n_{H_2}=n_{ZnCl_2}=n_{Zn}=0,3mol\\ V_{H_2}=0,3.22,4=6,72l\\ b)m_{ZnCl_2}=0,3.136=40,8g\\ c)n_{HCl.pư}=0,3.2=0,6mol\\ C_{\%ZnCl_2}=\dfrac{40,8}{200+19,5-0,3.2}\cdot100=18,64\%\\ C_{\%HCl.dư}=\dfrac{\left(0,8-0,6\right).36,5}{200+19,5-0,3.2}\cdot100=3,33\%\)
a)
$Fe + 2HCl \to FeCl_2 + H_2$
$n_{FeCl_2} = n_{Fe} = \dfrac{11,2}{56} = 0,2(mol)$
$m = 0,2.127 = 25,4(gam)$
b)
$n_{H_2} = n_{Fe} = 0,2(mol)$
$V_{H_2} = 0,2.22,4 = 4,48(lít)$
Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
a. PTHH: Fe + 2HCl ---> FeCl2 + H2
Theo PT: \(n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)
=> \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
b. Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\)
=> \(V_{H_2}=0,2.22,4=4,48\left(lít\right)\)
a)
$n_{Fe} = \dfrac{11,2}{56} = 0,2(mol) ; n_{HCl} = 0,1.2 = 0,2(mol)$
$Fe + 2HCl \to FeCl_2 + H_2$
Ta thấy :
$n_{Fe} : 1 > n_{HCl} : 2$ nên Fe dư
$n_{H_2} = \dfrac{1}{2}n_{HCl} = 0,1(mol)$
$V_{H_2} = 0,1.22,4 = 2,24(lít)$
b)
$n_{Fe\ pư} = n_{H_2} = 0,1(mol)$
$\Rightarrow m_{Fe\ dư} = 11,2 - 0,1.56 = 5,6(gam)$
c)
$n_{FeCl_2} = n_{Fe\ pư} = 0,1(mol)$
$C_{M_{FeCl_2}} = \dfrac{0,1}{0,1} = 1M$
\(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
\(n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,15 0,4 0,15
a) Lập tỉ số so sánh : \(\dfrac{0,15}{1}< \dfrac{0,4}{2}\)
⇒ Zn phản ứng hết , HCl dư
⇒ Tinsht toán dựa vào số mol của zn
\(n_{HCl\left(dư\right)}=0,4-\left(0,15.2\right)=0,1\left(mol\right)\)
⇒ \(m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)
b) \(n_{H2}=\dfrac{0,15.1}{1}=01,5\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,15.24,79=3,1875\left(l\right)\)
Chúc bạn học tốt
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ a.n_{H_2}=n_{H_2SO_4}=0,4\left(mol\right)\\ V_{H_2}=0,4.22,4=8,96\left(l\right)\\ b.n_{ZnSO_4}=n_{H_2SO_4}=0,4\left(mol\right)\\ m_{ZnSO_4}=0,4.161=64,4\left(g\right)\)