tính a)Khối lượng của 1,2 mol magie nitrat b)số mol của 16 gam sắt(III) oxit
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) Fe2O3 + 3CO --to--> 3CO2 + 2Fe
b) Theo ĐLBTKL: mFe2O3 + mCO = mCO2 + mFe
=> mCO2 = 16+8,4 - 11,2 = 13,2(g)
c)
\(n_{CO_2}=\dfrac{13,2}{44}=0,3\left(mol\right)\)
VCO2 = 0,3.22,4 = 6,72 (l)
Số phân tử CO2 = 0,3.6.1023 = 1,8.1023
\(a,Fe_2O_3+3CO\xrightarrow{t^o}2Fe+3CO_2\\ b,BTKL:m_{Fe_2O_3}+m_{CO}=m_{Fe}+m_{CO_2}\\ \Rightarrow m_{CO_2}=16+8,4-11,2=13,2(g)\\ c,n_{CO_2}=\dfrac{13,2}{44}=0,3(mol)\\ V_{CO_2}=0,3.22,4=6,72(l)\\ \text{Số phân tử }CO_2:0,3.6.10^{23}=1,8.6.10^{23}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1:
a) \(m_{Fe_2\left(SO_4\right)_3}=0,15.400=60\left(g\right)\)
b) \(m_{MgCl_2}=0,05.95=4,75\left(g\right)\)
c) \(m_{H_2}=0,2.2=0,4\left(g\right)\)
d) \(n_{N_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\Rightarrow m_{N_2}=0,2.28=5,6\left(g\right)\)
e) \(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\Rightarrow m_{O_2}=0,3.32=9,6\left(g\right)\)
Câu 2:
a) \(V_{NO_2}=0,25.22,4=5,6\left(mol\right)\)
b) \(V_{CO_2}=0,3.22,4=6,72\left(mol\right)\)
c) \(n_{Cl_2}=\dfrac{3,55}{35,5}=0,1\left(mol\right)\Rightarrow V_{Cl_2}=0,1.22,4=2,24\left(l\right)\)
d) \(n_{N_2O}=\dfrac{1,32}{44}=0,03\left(mol\right)\Rightarrow V_{N_2O}=0,03.22,4=0,672\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Mg}=\dfrac{6}{24}=0,25\left(mol\right)\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ 0,25.........0,5.........0,25.......0,25\left(mol\right)\\ a.V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ b.m_{HCl}=0,5.36,5=18,25\left(g\right)\\ c.n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\\ Fe_2O_3+3H_2\underrightarrow{^{to}}2Fe+3H_2O\\ Vì:\dfrac{0,25}{3}< \dfrac{0,1}{1}\\ \Rightarrow Fe_2O_3dư\\ n_{Fe}=\dfrac{2}{3}.0,25=\dfrac{1}{6}\left(mol\right)\\ \Rightarrow m_{Fe}=\dfrac{1}{6}.56\approx9,333\left(g\right)\)
a,\(n_{Mg}=\dfrac{6}{24}=0,25\left(mol\right)\)
PTHH: Mg + 2HCl → MgCl2 + H2
Mol: 0,25 0,5 0,25
\(\Rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)
b,\(m_{HCl}=0,5.36,5=18,25\left(g\right)\)
c,\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 → 2Fe + 3H2O
Mol: 0,25 \(\dfrac{1}{6}\)
Ta có: \(\dfrac{0,1}{1}>\dfrac{0,25}{3}\)⇒ Fe2O3 dư, H2 hết
\(m_{Fe}=\dfrac{1}{6}.56=9,33\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(CTHH:Fe_2O_3\)
\(M_{Fe_2O_3}=56.2+16.3=160\left(\dfrac{g}{mol}\right)\)
\(n_{Fe_2O_3}=\dfrac{m}{M}=\dfrac{8}{160}=0,05\left(mol\right)\\ \Rightarrow C\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Gọi CTHH của oxit sắt là $Fe_2O_n$
$Fe_2O_n + nCO \xrightarrow{t^o} 2Fe +nCO_2$
$n_{Fe} = \dfrac{22,4}{56} = 0,2(mol)$
$\Rightarrow n_{Fe_2O_n} = \dfrac{1}{2}n_{Fe} = 0,2(mol)$
$M_{oxit} = 56.2 + 16n = \dfrac{32}{0,2}=160$
Suy ra : n = 3
Vậy oxit cần tìm là $Fe_2O_3$
b) $n_{CO_2} = \dfrac{3}{2}n_{Fe} = 0,6(mol)$
$CO_2 +C a(OH)_2 \to CaCO_3 + H_2O$
$n_{CaCO_3} = n_{CO_2} = 0,6(mol)$
$m_{CaCO_3} = 0,6.100 = 60(gam)$
a. \(m_{Mg\left(NO_3\right)_2}=1,2.148=177,6\left(g\right)\)
b. \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)