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![](https://rs.olm.vn/images/avt/0.png?1311)
\(CaCO_3 \to CaO+CO_2\\ BTKL:\\ m_{CaCO_3}=m_{CaO}+m_{CO_2}\\ 150=m_{CaO}+66\\ \to m_{CaO}=84(g)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(CaCO_3\rightarrow\left(t^o\right)CaO+CO_2\\ n_{CaCO_3}=\dfrac{200}{100}=2\left(mol\right)\\ n_{CaO}=\dfrac{100,8}{56}=1,8\left(mol\right)\\ V\text{ì}:\dfrac{2}{1}>\dfrac{1,8}{1}\Rightarrow CaCO_3d\text{ư}\\ n_{CaCO_3\left(p.\text{ứ}\right)}=n_{CaO}=1,8\left(mol\right)\\ m_{CaCO_3\left(d\text{ư}\right)}=200-1,8.100=20\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1,PTHH:CaCO_3\underrightarrow{t^o}CaO+CO_2\)
\(áp,dụng.dlbtkl,ta.có:\)
\(m_{CaCO_3}=m_{CaO}+m_{CO_2}\\ m_{CO_2}=m_{CaCO_3}-m_{CaO}=5-2,8=2,2\left(g\right)\)
\(2,a,pthh:4P+5O_2\underrightarrow{t^o}P_2O_5\)
\(n_P=\dfrac{m}{M}=\dfrac{12.4}{31}=0,4\left(mol\right)\)
\(b,theo.pthh\Rightarrow n_{O_2}=\dfrac{5}{4}n_P=\dfrac{5}{4}.0,4=0,5\left(mol\right)\\ \Rightarrow V_{O_2}=n.22,4=0,5.22,4=11,2\left(l\right)\\ m_{O_2}=n.M=0,5.32=16\left(g\right)\)
1. Áp dụng ĐLBTKL, ta có:
\(m_{CaCO_3}=m_{CaO}+m_{CO_2}\)
\(\Leftrightarrow5=2,8+m_{CO_2}\)
\(\Leftrightarrow m_{CO_2}=5-2,8=2,2\left(g\right)\)
2. Ta có: \(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
a. \(PTHH:4P+5O_2\overset{t^o}{--->}2P_2O_5\)
b. Theo PT: \(n_{O_2}=\dfrac{5}{4}.n_P=\dfrac{5}{4}.0,4=0,5\left(mol\right)\)
Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}.n_P=\dfrac{1}{2}.0,4=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,5.22,4=11,2\left(lít\right)\\m_{P_2O_5}=0,2.142=28,4\left(g\right)\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
áp dụng định luận định luận bảo toang khối lượng :
m CaCO3=CaO+m CO2
=>m CO2=88g
=>B
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(n_{CaCO_3}=\dfrac{2}{100}=0,02\left(mol\right)\)
\(a.PTHH:CaCO_3+2HCl--->CaCl_2+CO_2\uparrow+H_2O\)
b. Theo PT: \(n_{CO_2}=n_{CaCO_3}=0,02\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,02.22,4=0,448\left(lít\right)\)
c. Theo PT: \(n_{HCl}=2.n_{CaCO_3}=2.0,02=0,04\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,04.36,5=1,46\left(g\right)\)
\(a,PTHH:CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
\(b,n_{CaCO_3}=\dfrac{m}{M}=\dfrac{2}{100}=0,02\left(mol\right)\\ Theo.PTHH:n_{CO_2}=n_{CaCO_3}=0,02\left(mol\right)\\ V_{CO_2\left(đktc\right)}=n.22,4=0,02.22,4=0,448\left(l\right)\)
\(b,Theo.PTHH:n_{HCl}=2.n_{CaCO_3}=2.0,02=0,04\left(mol\right)\\ m_{HCl}=n.M=0,04.36,5=1,46\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) PTHH: CaO + H2O ===> Ca(OH)2
b) nCaO = 2,8 / 56 = 0,05 (mol)
=> nCa(OH)2 = nCaO = 0,05 (mol)
=> mCa(OH)2 = 0,05 x 74 = 3,7 (gam)
a) Ta có:
nCaO= \(\frac{m_{CaO}}{M_{CaO}}=\frac{2,8}{56}=0,05\left(mol\right)\)
PTHH: CaO + H2O -> Ca(OH)2
b) Theo PTHH và đề bài, ta có:
\(n_{Ca\left(OH\right)_2}=n_{CaO}=0,05\left(mol\right)\)
Khối lượng Ca(OH)2 thu được:
\(m_{Ca\left(OH\right)_2}=n_{Ca\left(OH\right)_2}.M_{Ca\left(OH\right)_2}=0,05.74=3,7\left(g\right)\)
\(n_{CaCO_3}=\dfrac{20}{100}=0,2mol\)
\(CaCO_3\underrightarrow{t^o}CaO+CO_2\)
0,2 0,2 0,2
\(m_{CaO}=0,2\cdot56=11,2g\)
\(V_{CO_2}=0,2\cdot22,4=4,48l\)
\(CaO+H_2O\rightarrow Ca\left(OH\right)_2\)
0,2 0,2
\(m_{Ca\left(OH\right)_2}=0,2\cdot74=14,8g\)