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\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: Zn + 2HCl ---> FeCl2 + H2
0,3<---------------0,3<----0,3
=> \(\left\{{}\begin{matrix}m=0,3.65=19,5\left(g\right)\\m_{muối}=0,3.136=40,8\left(g\right)\\V_{ddHCl}:thiếu.C_M\end{matrix}\right.\)
\(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
LTL: \(0,2>\dfrac{0,3}{3}\) => Fe2O3 dư
Theo pthh: nFe2O3 (pư) = \(\dfrac{1}{3}n_{H_2}=\dfrac{1}{3}.0,3=0,1\left(mol\right)\)
nFe = \(\dfrac{2}{3}n_{H_2}=\dfrac{2}{3}.0,3=0,2\left(mol\right)\)
=> mchất rắn = 0,1.160 + 0,2.56 = 27,2 (g)
\(n_{CaO}=\dfrac{8}{40}=0,2\left(mol\right)\)
Pt : \(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2|\)
1 2 1 1
0,2 0,2 0,2
a) \(n_{Ca\left(OH\right)2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{Ca\left(OH\right)2}=0,2.74=14,8\left(g\right)\)
b) \(m_{ddspu}=8+100-\left(0,2.2\right)=107,6\left(g\right)\)
\(C_{ddNaOH}=\dfrac{14,8.100}{107,6}=13,75\)0/0
c)Pt : \(2HCl+Ca\left(OH\right)_2\rightarrow CaCl_2+2H_2O|\)
2 1 1 2
0,4 0,2
\(n_{HCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
\(V_{ddHCl}=\dfrac{0,4}{0,5}=0,8\left(l\right)\)
= 800ml
Chúc bạn học tốt
a, Gọi \(\left\{{}\begin{matrix}n_{Fe}=a\left(mol\right)\\n_{Al}=b\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH:
Fe + 2HCl ---> FeCl2 + H2
a--->2a------------------>a
2Al + 6HCl ---> 2AlCl3 + 3H2
b---->3b-------------------->1,5b
=> \(\left\{{}\begin{matrix}56a+27b=16,6\\a+1,5b=0,5\end{matrix}\right.\Leftrightarrow a=b=0,2\left(mol\right)\)
=> \(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=0,2.27=5,4\left(g\right)\end{matrix}\right.\)
b) \(C\%_{HCl}=\dfrac{\left(0,2.2+0,2.3\right).36,5}{300}.100\%=12,167\%\)
\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
gọi nFe : a , nAl: b (a,b>0) => 56a + 27b = 16,6 (g)
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
a a
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
b \(\dfrac{3b}{2}\)
=> \(a+\dfrac{3b}{2}=0,5\)
ta có hệ pt
\(\left\{{}\begin{matrix}56a+27b=16,6\\a+\dfrac{3b}{2}=0,5\end{matrix}\right.\)
=> a= 0,2 , b = 0,2
\(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=16,6-11,2=5,4\left(g\right)\end{matrix}\right.\)
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\)
0,2 0,4
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,6
=> \(m_{HCl}=\left(0,4+0,6\right).36,5=36,5\left(g\right)\)
=> \(C\%=\dfrac{36,5}{200}.100\%=18,25\%\)
a)
\(2Al + 6HCl \to 2AlCl_3 + 3H_2 \)
b)
Tỉ lệ số nguyên tử Al : số phân tử HCl : số phân tử AlCl3 : số phân tử H2 là 2 : 6 : 2 : 3
c)
Ta có : \(n_{Al} = \dfrac{13,5}{27} = 0,5(mol)\)
Theo PTHH : \(n_{H_2} = \dfrac{3}{2}n_{Al} = 0,75(mol)\\ \Rightarrow V_{H_2} = 0,75.22,4 = 16,8(lít)\)
a) Fe + 2HCl --> FeCl2 + H2
b) \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
_____0,1--------------->0,1---->0,1
=> mFeCl2 = 0,1.127 = 12,7(g)
c) VH2 = 0,1.22,4 = 2,24(l)
\(n_{Fe}=\dfrac{5,6}{56}=0,1(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{FeCl_2}=n_{H_2}=0,1(mol)\\ a,m_{FeCl_2}=0,1.127=12,7(g)\\ b,V_{H_2}=0,1.22,4=2,24(l)\)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{HCl}=\dfrac{24,6375}{36,5}=0,675\left(mol\right)\)
PTHH: 2Al + 6HCl ---> 2AlCl3 + 3H2
LTL: \(\dfrac{0,2}{2}< \dfrac{0,675}{3}\rightarrow\) HCl dư
Theo pthh: \(\left\{{}\begin{matrix}n_{HCl\left(pư\right)}=3n_{Al}=3.0,2=0,6\left(mol\right)\\n_{H_2}=\dfrac{3}{2}n_{Al}=\dfrac{3}{2}.0,2=0,3\left(mol\right)\\n_{AlCl_3}=n_{Al}=0,2\left(mol\right)\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\\m_{HCl\left(dư\right)}=\left(0,675-0,5\right).36,5=2,7375\left(g\right)\\V_{H_2}=0,3.22,4=6,72\left(l\right)\end{matrix}\right.\)
a) $n_{H_2SO_4} = \dfrac{44,1}{98} = 0,45(mol)$
$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
Theo PTHH :
$n_{Al} = \dfrac{2}{3}n_{H_2SO_4} = 0,3(mol)$
$m_{Al} = 0,3.27 = 8,1(gam)$
b) $n_{H_2} = n_{H_2SO_4} = 0,45(mol)$
$\Rightarrow V_{H_2} = 0,45.22,4 =1 0,08(lít)$
c)
Cách 1 : $n_{Al_2(SO_4)_3} = \dfrac{1}{3}n_{H_2SO_4} = 0,15(mol)$
$\Rightarrow m_{Al_2(SO_4)_3} = 0,15.342 = 51,3(gam)$
Cách 2 : Bảo toàn khối lượng, $m_{Al_2(SO_4)_3} = 8,1 + 44,1 - 0,45.2 = 51,3(gam)$
Ta có: \(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
_____0,05__0,1____________0,05 (mol)
b, mFe = 0,05.56 = 2,8 (g)
c, mHCl = 0,1.36,5 = 3,65 (g)
\(\Rightarrow m_{ddHCl}=\dfrac{3,65}{10\%}=36,5\left(g\right)\)
Bạn tham khảo nhé!
Ta có: \(n_{H_2SO_4}=\dfrac{58,8}{98}=0,6\left(mol\right)\)
\(PTHH:2Al+3H_2SO_4--->Al_2\left(SO_4\right)_3+3H_2\uparrow\)
0,4 <--- 0,6 -----------> 0,2 --> 0,6
\(\Rightarrow\left\{{}\begin{matrix}m_{Al}=0,4.27=10,8\left(g\right)\\m_{Al_2\left(SO_4\right)_3}=0,2.342=68,4\left(g\right)\\V_{H_2}=0,6.22,4=13,44\left(lít\right)\end{matrix}\right.\)
nH2 = 0,6 mol
a) pt: 2Al +6HCl=2AlCl2+3H2
b) nAl = 0,6 . 2 : 3=0,4mol
m=mAl=0,4 . 27=10,8g
c) nHCl=0,6 . 6 : 3=1,2 mol
mHCl=1,2 . 36,5=43,8g
d) nAlCl3=nAl=0,4
mAlCl3=0,4 . 133,5=53,4g