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PTHH: \(3NaOH+FeCl_3\rightarrow3NaCl+Fe\left(OH\right)_3\downarrow\)
Ta có: \(n_{NaOH}=\dfrac{10}{40}=0,25\left(mol\right)\)
\(\Rightarrow n_{FeCl_3}=n_{Fe\left(OH\right)_3}=\dfrac{1}{12}\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}m_{FeCl_3}=\dfrac{1}{12}\cdot162,5\approx13,54\left(g\right)\\m_{Fe\left(OH\right)_3}=\dfrac{1}{12}\cdot107\approx8,92\left(g\right)\end{matrix}\right.\)
nNaOH = m/M = 10/(23 +16 + 1) = 0,25 (mol)
Ta có PTHH: 3NaOH + FeCl3 ------> Fe(OH)3 + 3NaCl
Theo PT: 3 - 1 - 1 (mol)
BC: 0.25 - 0.083 - 0.083 (mol)
Suy ra: mFeCl3 = n x M = 0.083 x (56 + 35,5 x 3) = 13,4875 (g)
mFe(OH)3 = n x M = 0,083 x (56+17 x 3) = 8,881 (g)
số mol NaOH là:\(n_{NaOH}=\frac{10}{23+16+1}=0,25\left(mol\right)\)
PTHH\(3NaOH+FeCl_3\rightarrow Fe\left(OH\right)_3+3NaCl\)
\(m_{FeCl_3}=n.M=\frac{0.25}{3}\cdot\left(56+35,5\cdot3\right)\approx13,54\left(g\right)\)
\(m_{Fe\left(OH\right)_3}=n.M=\frac{0.25}{3}\cdot\left(56+\left(16+1\right)\cdot3\right)\approx8,91\left(g\right)\)
\(m_{NaCl}=n.M=0.25\cdot\left(23+35.5\right)=14.625\left(g\right)\)
a) nNaOH= 6/40=0,15(mol)
nFeCl3=32,5/162,5= 0,2(mol)
PTHH: 3 NaOH + FeCl3 -> Fe(OH)3 + 3 NaCl
0,15________0,05____0,05________0,15(mol)
Ta có: 0,2/1 > 0,15/3
=> NaOH hết, FeCl3 dư
=> nFeCl3(dư)= 0,2-0,05=0,15(mol)
=> mFeCl3= 162,5.0,15=24,375(g)
b)m(kết tủa)= mFe(OH)3= 0,05.107= 5,35(g)
\(a.n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\\ n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ Fe_2O_3+3H_2\underrightarrow{to}2Fe+3H_2O\\ Vì:\dfrac{0,3}{3}< \dfrac{0,15}{1}\\ \rightarrow Fe_2O_3dư\\ n_{Fe_2O_3\left(dư\right)}=0,15-\dfrac{0,3}{3}=0,05\left(mol\right)\\ m_{Fe_2O_3\left(dư\right)}=0,05.160=8\left(g\right)\\ b.n_{Fe}=\dfrac{0,3}{3}.2=0,2\left(mol\right)\\ m_{Fe}=0,2.56=11,2\left(g\right)\\ c.m_{rắn}=m_{Fe}+m_{Fe_2O_3\left(dư\right)}=11,2+8=19,2\left(g\right)\)
3Fe + 2O2 → Fe3O4
Theo pt : 3 2 1 mol
Theo đề bài : 0,2 0,3 0,2/3
a.
Ta có tỉ lệ \(\dfrac{0,2}{3}< \dfrac{0,3}{2}\) nên Fe phản ứng hết , oxi dư số mol sắt từ thu được tính theo Fe
b. nFe3O4 = 0,2/3 mol ==> m Fe3O4 = 0,2 /3 .232 = 15,47 gam
`1)`
`a) 3Fe + 2O_2 -> Fe_3O_4`
`b) 3NaOH + FeCl_3 -> Fe(OH)_3 + 3NaCl`
`c) N_2 + 3H_2 -> 2NH_3`
`d) 2KClO_3 -> 2KCl + 3O_2` (Đáng ra là `KClO_3` chứ?)
`e) 4C_xH_y + (4x+y)O_2 -> 4xCO_2 + 2yH_2O`
`2)`
`a) 2Mg + O_2 -> 2MgO`
`b) 2Fe + 3Cl_2 -> 2FeCl_3`
`c) 2NaOH + CuCl_2 -> Cu(OH)_2 + 2NaCl`
`d) H_2 + Cl_2 -> 2HCl`
`e) Mg + 2HCl -> MgCl_2 + H_2`
`3)`
`a) n_{Fe} = m/M = (5,6)/(56) = 0,1 (mol)`
`b) V_{H_2(đktc)} = n.22,4 = 0,25.22,4 = 5,6 (l)`
`c) n_{CO_2} = (V_{(đktc)})/(22,4) = (4,48)/(22,4) = 0,2 (mol)`
`=> m_{CO_2} = n.M = 0,2.44 = 8,8 (g)`
`d)` \(n_{CO_2}=\dfrac{9,6.10^{23}}{6.10^{23}}=1,6\left(mol\right)\)
`4)`
`a) CO_2: \%C = (12)/(44) .100\% = 27,27\%`
`\%H = 100\% - 27,27\% = 72,73\%`
`b) CaO: \%Ca = (40)/(56) .100\% = 71,43\%`
`\%O = 100\% - 71,43\% = 28,57\%`
Bài 1 :
\(a) CaCO_3 \xrightarrow{t^o} CaO + CO_2\\ 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\\ b) CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O\\ 2Fe(OH)_3 + 6HCl \to 2FeCl_3 + 6H_2O\\ NaOH + HCl \to NaCl + H_2O\\ c) 2AgNO_3 + 2NaOH \to 2NaNO_3 + Ag_2O + H_2O\\ NaCl + AgNO_3 \to AgCl + NaNO_3\)
\(n_{Fe}=\dfrac{12.6}{56}=0.225\left(mol\right)\)
\(n_{O_2}=\dfrac{4.2}{22.4}=0.1875\left(mol\right)\)
\(3Fe+2O_2\underrightarrow{^{^{t^0}}}Fe_3O_4\)
\(3.........2\)
\(0.225......0.1875\)
Lập tỉ lệ : \(\dfrac{0.225}{3}< \dfrac{0.1875}{2}\Rightarrow O_2dư\)
\(m_{O_2\left(dư\right)}=\left(0.1875-0.225\cdot\dfrac{2}{3}\right)\cdot32=1.2\left(g\right)\)
\(m_{Fe_3O_4}=\dfrac{0.225}{3}\cdot232=17.4\left(g\right)\)
\(n_{Mg\left(OH\right)_2}=a\left(mol\right)\)
\(n_{Fe\left(OH\right)_3}=b\left(mol\right)\)
\(m_{hh}=58a+107b=16.9\left(g\right)\left(1\right)\)
\(Mg\left(OH\right)_2\underrightarrow{^{^{t^0}}}MgO+H_2O\)
\(a.............a\)
\(2Fe\left(OH\right)_3\underrightarrow{^{^{t^0}}}Fe_2O_3+3H_2O\)
\(b.............\dfrac{b}{2}\)
\(m_{Cr}=40a+160\cdot\dfrac{b}{2}=12.4\left(g\right)\left(1\right)\)
\(\left(1\right),\left(2\right):a=0.07,b=0.12\)
\(\%m_{Mg\left(OH\right)_2}=\dfrac{0.07\cdot40}{16.9}\cdot100\%=16.57\%\)
\(\%m_{Fe\left(OH\right)_3}=83.43\%\)
Na2O ?