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Theo PTHH: \(n_{CaCO_3}=n_{CaO}=n_{CO_2}\)
a) \(n_{CaCO_3}=\dfrac{30}{100}=0,3\left(mol\right)=n_{CaO}=n_{CO_2}\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaO}=0,3\cdot56=16,8\left(g\right)\\V_{CO_2}=0,3\cdot22,4=6,72\left(l\right)\end{matrix}\right.\)
b) Tương tự câu a
c) \(n_{CO_2}=\dfrac{33,6}{22,4}=1,5\left(mol\right)=n_{CaO}=n_{CaCO_3}\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaCO_3}=1,5\cdot100=150\left(g\right)\\m_{CaO}=1,5\cdot56=84\left(g\right)\end{matrix}\right.\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
5.
a, Theo giả thiết ta có:
\(\left\{{}\begin{matrix}\dfrac{A}{B}=\dfrac{7}{4}\\A+2B=120\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}A=56\left(Fe\right)\\B=32\left(S\right)\end{matrix}\right.\)
b, Theo giả thiết ta có:
\(x+31+4.16=98\Rightarrow x=3\)
c, Theo giả thiết ta có:
\(\left\{{}\begin{matrix}A+3B=2,5.O_2=80\\\dfrac{A}{B}=\dfrac{1}{2}\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}A=\dfrac{80}{7}\\B=\dfrac{160}{7}\end{matrix}\right.\)
Đề sai à.
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a) \(n_{CaO}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Ta có: \(n_{CaCO_3}=n_{CaO}=0,2\left(mol\right)\)
b) \(n_{CaO}=\dfrac{7}{56}=0,125\left(mol\right)\)
Ta có : \(n_{CaCO_3}=n_{CaO}=0,125\left(mol\right)\)
=> \(m_{CaCO_3}=0,125.100=12,5\left(g\right)\)
c) \(n_{CO_2}=n_{CaCO_3}=3,5\left(mol\right)\)
=> \(V_{CO_2}=3,5.22,4=78,4\left(lít\right)\)
d) \(n_{CO_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
Ta có: \(n_{CO_2}=n_{CaCO_3}=n_{CaO}=0,6\left(mol\right)\)
=> \(m_{CaCO_3}=0,6.100=60\left(g\right)\)
\(m_{CaO}=0,6.56=33,6\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Phương trình hóa học CaCO3 → CaO + CO2.
a) nCaO = = 0,2 mol.
Theo PTHH thì nCaCO3 = nCaO = 0,2 (mol)
b) nCaO = = 0,125 (mol)
Theo PTHH thì nCaCO3 = nCaO = 0,125 (mol)
mCaCO3 = M.n = 100.0,125 = 12,5 (g)
c) Theo PTHH thì nCO2 = nCaCO3 = 3,5 (mol)
VCO2 = 22,4.n = 22,4.3,5 = 78,4 (lít)
d) nCO2 = = 0,6 (mol)
Theo PTHH nCaO = nCaCO3 = nCO2 = 0,6 (mol)
mCaCO3 = n.M = 0,6.100 = 60 (g)
mCaO = n.M = 0,6.56 = 33,6 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
1,5 mol phân tử khối hợp chất CaCO\(_3\)chứa: 1,5.6.10\(^{23}\)=9.10\(^{23}\)phân tử
![](https://rs.olm.vn/images/avt/0.png?1311)
Bảo toàn KL: \(m_{CaCO_3}=m_{CaO}+m_{CO_2}=22,4+17,6=40(g)\)
\(\%_{CaCO_3}=\dfrac{40}{50}.100\%=80\%\)
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\(m_{CaCO_3\left(nguyênchất\right)}=1500000.\left(100\%-5\%\right)=1425000\left(g\right)\)
\(\Rightarrow n_{CaCO_3}=\dfrac{1425000}{100}=14250\left(mol\right)\)
PTHH: CaCO3 ---to→ CaO + CO2
Mol: 14250 14250
\(m_{CaO}=14250.40=570000\left(g\right)=0,57\left(tấn\right)\)
PTKCaCO3 =PTKCa + PTKC + 3PTKO
= 40 + 12 +16 x 3 =100 đvC
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PTKCaCO3 = NTKCA + NTKC + NTKO * 3
= 40 (đvC) + 12 (đvC) + 3 * 16 (đvC)
= 40 (đvC) + 12 (đvC) + 48 (đvC)
= 100 (đvC)