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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)
Bảo toàn KL: \(m_{Fe_2O_3}+m_{CO}=m_{Fe}+m_{CO_2}\)
\(\Rightarrow m_{Fe}=180+70-110=140\left(g\right)\)
Chọn D
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{O_2}=\dfrac{8}{32}=0.25\left(mol\right)\)
\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)
\(0.125....0.25....0.125\)
\(m_{CH_4}=0.125\cdot16=2\left(g\right)\)
\(V_{CO_2}=0.125\cdot22.4=2.8\left(l\right)\)
\(Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\)
\(............0.125.....0.125\)
\(m_{CaCO_3}=0.125\cdot100=12.5\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ n_{Fe_3O_4}=\dfrac{23,2}{232}=0,1\left(mol\right)\\ 4CO+Fe_3O_4\rightarrow\left(t^o\right)3Fe+4CO_2\\ V\text{ì}:\dfrac{0,1}{1}>\dfrac{0,2}{4}\Rightarrow Fe_3O_4d\text{ư}\\ \Rightarrow n_{Fe}=\dfrac{3}{4}.0,2=0,15\left(mol\right)\\ n_{Fe_3O_4\left(d\text{ư}\right)}=0,1-\dfrac{0,2}{4}=0,05\left(mol\right)\\ m_{r\text{ắn}}=m_{Fe_3O_4\left(d\text{ư}\right)}+m_{Fe}=0,05.232+0,15.56=20\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) C + O2 --to--> CO2
b) \(n_C=\dfrac{2,4}{12}=0,2\left(mol\right)\)
PTHH: C + O2 --to--> CO2
_____0,2->0,2------>0,2
=> mCO2 = 0,2.44 = 8,8 (g)
c) VO2 = 0,2.22,4 = 4,48(l)
=> Vkk = 4,48.5 = 22,4 (l)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(PTHH:C+O_2\) → \(CO_2\)
bạn xem lại đề nha chỉ làm được mỗi câu a
a) C + O2 --to--> CO2
b) \(n_C=\dfrac{2.4}{12}=0,2\left(mol\right)\)
PTHH: C + O2 --to--> CO2
_____0,2->0,2------>0,2
=> mCO2 = 0,2.44 = 8,8 (g)
c) VO2 = 0,2.22,4 = 4,48(l)
=> Vkk = 4,48.5 = 22,4 (l)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Đặt:n_{Fe}=a\left(mol\right),n_{FeO}=b\left(mol\right)\)
\(m_{hh}=56a+72b=9.2\left(g\right)\left(1\right)\)
\(n_{SO_2}=\dfrac{3.92}{22.4}=0.175\left(mol\right)\)
\(Fe^0\rightarrow Fe^{+3}+3e\)
\(Fe^{+2}\rightarrow Fe^{+3}+1e\)
\(S^{+6}+2e\rightarrow S^{+4}\)
\(\text{Bảo toàn electron: 3a + b = 0.35 (2)}\)
\(\left(1\right),\left(2\right):a=0.1,b=0.05\)
\(m_{Fe}=0.1\cdot56=5.6\left(g\right)\)
\(m_{FeO}=0.05\cdot72=3.6\left(g\right)\)
\(n_{H_2SO_4}=0.1\cdot3+0.05\cdot2=0.4\left(mol\right)\)
\(m_{H_2SO_4}=0.4\cdot98=39.2\left(g\right)\)
\(m_{ddH_2SO_4}=\dfrac{39.2\cdot100}{98}=40\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
nCaCO3=\(\dfrac{100}{100}\)=1mol; nNaOH=\(\dfrac{60}{40}\)=1,5mol
CaCO3 + 2HCl → CaCl2 + CO2 ↑ + H2O
1mol → 1mol
Vì 1 < \(\dfrac{nNaOH}{nCO2}\)=1,51=1,5< 2 ⇒Tạo thành 2 muối
CO2 + NaOH → NaHCO3
x x x (mol)
CO2 + 2NaOH → Na2CO3 + H2O
y 2y y (mol)
Ta có hệ phương trình: \(\left\{{}\begin{matrix}x+y=1\\x+2y=1,5\end{matrix}\right.\)⇒ x=y=0,5mol
mNaHCO3= 84.0,5 = 42 (gam); mNa2CO3= 106.0,5 = 53 (gam)
Khối lượng muối thu được:
mmuối = mNaHCO3 +mNa2CO3 = 42 + 53 = 95 (gam).
Đặt số mol Na2CO3, NaHCO3 lần lượt là x, y mol → 106x + 84y= 100 (gam) 2NaHCO3 → Na2CO3+ CO2+ H2O ymol y/2 mol → mNa2CO3= (x+y/2).106= 69 gam Giải hệ trên ta có x= 8/53 mol; y= 1mol → %mNa2CO3= 16%; %mNaHCO3= 84%
a) PTHH:FeO + CO -to-> Fe + CO2
b) Theo ĐLBTKL, ta có:
mFeO+ mCO= mFe + mCO2
=> mCO2=(mFeO + mCO)-mFe= (14+36)-28=22(g)