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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.Ta có: nHCl=1.\(\frac{200}{1000}\)=0,2(mol)
Ta có phương trình 2Al + 6HCl -----> 2AlCl3 + 3H2 (1)
Theo phương trình: 2 mol 6 mol 3 mol
Theo đề: x mol 0,2 mol 0,1 mol
=> V\(H_2\)=0,1.22,4=2,24(l)
b. Từ pt (1), ta có:
mAl=x.27=\(\frac{0,2.2}{6}\).27=1,8(g)
c.Từ pt (1), ta có: mHCl=0,2. (1+35,5)=7,3(g)
mdd=\(\frac{200}{1000}.22,4.18=80,64\left(g\right)\)
=>C%=\(\frac{7,3}{80,64}.100\%=9,1\%\)
Ungr hộ nha!
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2.......0.4...................0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(C_{M_{HCl}}=\dfrac{0.4}{0.4}=1\left(M\right)\)
\(n_{CuO}=\dfrac{8}{80}=0.1\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{t^0}}Cu+H_2O\)
\(1............1\)
\(0.1.........0.2\)
\(LTL:\dfrac{0.1}{1}< \dfrac{0.2}{1}\Rightarrow H_2dư\)
\(n_{Cu}=n_{CuO}=0.1\left(mol\right)\)
\(m_{Cu}=0.1\cdot64=6.4\left(g\right)\)
Chúc em học tốt và có những trải nghiệm tuyệt vời tại hoc24.vn nhé !
a) nFe=0,2(mol)
PTHH: Fe + 2HCl -> FeCl2 + H2
0,2_________0,4____0,2___0,2(mol)
V(H2,dktc)=0,2.22,4=4,48(l)
b) VddHCl=0,4/0,4=1(l)
c) nCuO=0,1(mol)
PTHH: CuO + H2 -to-> Cu + H2O
Ta có: 0,2/1 > 0,1/1
=> CuO hết, H2 dư, tính theo nCuO
-> nCu=nCuO=0,1(mol)
=>mCu=0,1.64=6,4(g)
\(n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,6 1,2 0,6 0,6 ( mol )
\(m_{Fe}=0,6.56=33,6g\)
\(m_{FeCl_2}=0,6.127=76,2g\)
\(C_{M_{HCl}}=\dfrac{1,2}{0,6}=2M\)
`Fe + 2HCl -> FeCl_2 + H_2↑`
`0,3` `0,6` `0,3` `0,3` `(mol)`
`n_[H_2] = [ 6,72 ] / [ 22,4 ] = 0,3 (mol)`
`-> m_[Fe] = 0,3 . 56 = 16,8 (g)`
`-> m_[FeCl_2] = 0,3 . 127 = 38,1 (g)`
`b) C_[M_[HCl]] = [ 0,6 ] / [ 0,3 ] = 2 (M)`
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: Fe + 2HCl ---> FeCl2 + H2
0,3<---0,6<------0,3<-----0,3
=> \(\left\{{}\begin{matrix}m_{Fe}=0,3.56=16,8\left(g\right)\\m_{FeCl_2}=127.0,3=38,1\left(g\right)\\C_{M\left(HCl\right)}=\dfrac{0,6}{0,3}=2M\end{matrix}\right.\)
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, $m_{Al_2(SO_4)_3} = 8,1 + 44,1 - 0,45.2 = 51,3(gam)$
Fe + 2HCl \(\rightarrow\)FeCl2 + H2
nFe=\(\dfrac{8,4}{56}=0,15\left(mol\right)\)
Theo PTHH ta có:
nFe=nH2=0,15(mol)
VH2=0,15.22,4=3,36(lít)
b;Theo PTHH ta có:
2nFe=nHCl=0,3(mol)
mHCl=0,3.36,5=10,95(g)
mdd HCl=\(10,95:\dfrac{10,95}{100}=100\left(g\right)\)
c;
Theo PTHH ta có:
nFe=nFeCl2=0,15(mol)
mFeCl2=0,15.127=19,05(g)
C% dd FeCl2=\(\dfrac{19,05}{8,4+100-0,15.2}.100\%=17,6\%\)
nFe=m/M=8,4/56=0,15(mol)
PT: Fe + 2HCl -> FeCl2 +H2
vậy:0,15-->0,3----->0,15-->0,15(mol)
=> VH2=n.22,4=0,15.22,4=3,36(lít)
b)mHCl=n.M=0,3.36,5=10,95(g)
\(\Rightarrow m_{ddHCl}=\dfrac{m_{HCl}.100\%}{C\%}=\dfrac{10,95.100}{10,95}=100\left(g\right)\)
c) md d sau phan ứng=mFe +md d HCl-mH2=8,4+100-(0,15.2)=108,1(g)
mFeCl2=n.M=0,15.127=19,05(g)
\(\Rightarrow C\%_{ddsauphanung}=\dfrac{m_{FeCl_2}.100\%}{m_{ddsauphanung}}=\dfrac{19,05.100}{108,1}\approx17,622\left(\%\right)\)
a,nAl=\(\dfrac{5,4}{27}=0,2\left(mol\right)\);nHCl=\(\dfrac{200.7,3}{100.36,5}=0,4\left(mol\right)\)
2Al +6 HCl --> 2AlCl3 +3 H2
mol: 0,2 0,4
p.ứ: \(\dfrac{2}{15}\) 0,4
sau p.ứ: \(\dfrac{1}{15}\) 0 \(\dfrac{2}{15}\) 0,2
VH2= 0,2.22,4=4,48(l)
b,mdd=5,4 + 200 - 0,2.2 - \(\dfrac{1}{15}\).27 =203,2 (g)
C%=\(\dfrac{\dfrac{2}{15}.133,5.100\%}{203,2}\approx8,76\%\)
Ta co pthh
2Al + 6HCl \(\rightarrow\) 2AlCl3 + 3H2
Theo de bai ta co
nAl=\(\dfrac{5,4}{27}=0,2mol\)
mHCl= \(\dfrac{mdd.C\%}{100\%}=\)\(\dfrac{200.7,3\%}{100\%}=14,6g\)
\(\Rightarrow\)nHCl=\(\dfrac{14,6}{36,5}=0,4mol\)
Theo pthh
\(nAl=\dfrac{0,2}{2}mol>nHCl=\dfrac{0,4}{6}mol\)
\(\Rightarrow nAl\) du ( tinh theo so mol cua HCl)
a, Theo pthh
nH2=\(\dfrac{3}{6}nHCl=\dfrac{3}{6}.0,4=0,2mol\)
\(\Rightarrow\) VH2=0,2.22,4=4,48 l
b, Theo pthh
nAlCl3=\(\dfrac{2}{6}nHCl=\dfrac{2}{6}.0,4=\dfrac{2}{15}mol\)
\(\Rightarrow\) mAlCl3=\(\dfrac{2}{15}.133,5=17,8g\)
mddAlCl3=mAl + mddHCl - mH2 = 5,4 + 200 - \(\left(0,2.2\right)\)=205 g
\(\Rightarrow\) Nong do % cua dd sau phan ung la
C%=\(\dfrac{mct}{mdd}.100\%=\dfrac{17,8}{205}.100\%\approx8,68\%\)