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\(a.Fe+2HCl\rightarrow FeCl_2+H_2\\b.n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ n_{H_2}=n_{Fe}=0,1\left(mol\right)\\ \Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\\ c.n_{FeCl_2}=n_{Fe}=0,1\left(mol\right)\\ m_{FeCl_2}=0,1.127=12,7\left(g\right) \)
\(a)n_{Fe}=\dfrac{5,6}{56}=0,1mol\\ n_{Mg}=\dfrac{4,8}{24}=0,2mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,4 0,2 0,2
\(V_{H_2}=\left(0,1+0,2\right).22,4=6,72l\\ b)V_{ddHCl}=\dfrac{0,2+0,4}{2}=0,3l\\ c)m_{muối}=0,1.127+95.0,2=31,7g\)
Câu 1 :
$2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O$
$Fe_2O_3 + 3CO \xrightarrow{t^o} 2Fe + 3CO_2$
$Fe + 2HCl \to FeCl_2 + H_2$
$FeCl_2 + 2KOH \to Fe(OH)_2 + 2KCl$
Câu 2 :
$a) Zn + 2HCl \to ZnCl_2 + H_2$
b) Theo PTHH : $n_{H_2} = n_{Zn} = \dfrac{32,5}{65} = 0,5(mol)$
$V_{H_2} = 0,5.22,4 = 11,2(lít)$
c) $n_{ZnCl_2} = 0,5(mol) \Rightarrow m_{ZnCl_2} = 136.0,5 = 68(gam)$
d) $n_{HCl} = 2n_{Zn} = 1(mol) \Rightarrow C_{M_{HCl}} = \dfrac{1}{0,4} = 2,5M$
\(a,PTHH:Na_2CO_3+H_2SO_4\rightarrow Na_2SO_4+H_2O+CO_2\uparrow\\ b,n_{Na_2CO_3}=\dfrac{10,6}{106}=0,1\left(mol\right)\\ \Rightarrow n_{Na_2SO_4}=0,1\left(mol\right)\\ \Rightarrow m_{Na_2SO_4}=0,1\cdot142=14,2\left(g\right)\\ c,n_{CO_2}=n_{Na_2CO_3}=0,1\left(mol\right)\\ \Rightarrow V_{CO_2\left(đktc\right)}=0,1\cdot22,4=2,24\left(l\right)\)
\(d,n_{Ca\left(OH\right)_2}=0,5\cdot0,3=0,15\left(mol\right)\\ PTHH:CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow+H_2O\)
Vì \(\dfrac{n_{Ca\left(OH\right)_2}}{1}>\dfrac{n_{CO_2}}{1}\) nên Ca(OH)2 dư, tính theo CO2
\(\Rightarrow n_{CaCO_3}=n_{CO_2}=0,1\left(mol\right)\\ \Rightarrow m_{CaCO_3}=0,1\cdot100\cdot80\%=8\left(g\right)\)
mHCl= 3,65%.400= 14,6(g) => nHCl=14,6/36,5=0,4(mol)
a) PTHH: Mg +2 HCl -> MgCl2 + H2
0,2__________0,4_____0,2____0,2(mol)
V(H2,đktc)=0,2.22,4=4,48(l)
b)mMg=0,2.24=4,8(g)
c) mMgCl2= 0,2.95=19(g)
mddMgCl2= 400+4,8 - 0,2.2= 404,4(g)
=> C%ddMgCl2= (19/404,4).100=4,698%
a) $n_{CaCO_3} = 0,15(mol)$
$CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O$
$n_{HCl} = 2n_{CaCO_3} = 0,3(mol)$
$m_{dd\ HCl} = \dfrac{0,3.36,5}{7,3\%} = 150(gam)$
b)
$n_{CaCl_2} = n_{CO_2} = n_{CaCO_3} =0,15(mol)$
$V_{CO_2} = 0,15.22,4 = 3,36(lít)$
c)
$m_{dd} = 15 + 150 - 0,15.44 = 158,4(gam)$
$C\%_{CaCl_2} = \dfrac{0,15.111}{158,4}.100\% = 10,51\%$
a. PTHH:
Fe + 2HCl ---> FeCl2 + H2 (1)
Mg + 2HCl ---> MgCl2 + H2 (2)
b. Gọi x, y lần lượt là số mol của Fe và Mg
Ta có: \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
Theo PT(1): \(n_{H_2}=n_{Fe}=x\left(mol\right)\)
Theo PT(2): \(n_{H_2}=n_{Mg}=y\left(mol\right)\)
\(\Rightarrow x+y=0,25\) (*)
Theo đề, ta lại có: 56x + 24y = 8,25 (**)
Từ (*) và (**), ta có HPT:
\(\left\{{}\begin{matrix}x+y=0,25\\56x+24y=8,25\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\approx0,07\\y\approx0,18\end{matrix}\right.\)
=> \(m_{Fe}=0,07.56=3,92\left(g\right)\)
=> \(\%_{m_{Fe}}=\dfrac{3,92}{8,25}.100\%=47,52\%\)
\(\%_{m_{Mg}}=100\%-47,52\%=52,48\%\)
a,Mg+2HCl=>MgCl2+H2
b,nHCl=0,05.3=0,15(mol)
nMg=12/24=0,5(mol)=>Mg dư, tính thao HCl
nH2=1/2 nHCl=0,075(mol)
=>VH2=0,075.22,4=1,68(l)
c,nMgCl2=nH2=0,075(mol)
mMgCl2=0,075.95=7,125(g)
a)\(Mg+2HCl\rightarrow MgCl_2+H_2\)
b) \(n_{Mg}=\dfrac{12}{24}=0,5\left(mol\right)\)
\(n_{HCl}=0,05.3=0,15\)
Ta có \(\dfrac{0,15}{2}< \dfrac{0,5}{1}\)nên Mg dư, tính theo HCl
\(n_{H_2}=\dfrac{n_{HCl}}{2}=0,075\left(mol\right)\)
\(V_{H_2}=0,075.22,4=1,68\left(l\right)\)
c) \(n_{MgCl_2}=\dfrac{n_{HCl}}{2}=0,075\left(mol\right)\)
\(m_{MgCl_2}=0,075.95=7,125g\)
a: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,1 0,2 0,1 0,1
b: \(V_{H_2}=0.1\cdot22.4=2.24\left(lít\right)\)
c: \(m_{FeCl_2}=0.1\left(56+35.5\cdot2\right)=12.7\left(g\right)\)
Thank you