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a, \(n_{C_2H_4}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PT: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)
Theo PT: \(n_{CaCO_3}=n_{CO_2}=2n_{C_2H_4}=0,1\left(mol\right)\)
\(\Rightarrow m_{CaCO_3}=0,1.100=10\left(g\right)\)
b, Theo PT: \(n_{O_2}=3n_{C_2H_4}=0,15\left(mol\right)\Rightarrow V_{O_2}=0,15.22,4=3,36\left(l\right)\)
\(\Rightarrow V_{kk}=\dfrac{V_{O_2}}{20\%}=16,8\left(l\right)\)
a, PT: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
Ta có: \(n_{C_2H_4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{O_2}=3n_{C_2H_4}=0,45\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,45.22,4=10,08\left(l\right)\)
b, Theo PT: \(n_{CO_2}=2n_{C_2H_4}=0,3\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,3.22,4=6,72\left(l\right)\)
c, PT: \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)
Theo PT: \(n_{CaCO_3}=n_{CO_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{\downarrow}=m_{CaCO_3}=0,3.100=30\left(g\right)\)
Bạn tham khảo nhé!
a) \(n_{C_2H_4}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)
PTHH: \(C_2H_4+3O_2\xrightarrow[]{t^o}2CO_2+2H_2O\)
0,2---->0,6---->0,4---->0,4
\(\Rightarrow V_{O_2}=0,6.24,79=14,874\left(l\right)\)
b) \(V_{CO_2}=0,4.22,4=9,916\left(l\right)\)
c) \(Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3\downarrow+H_2O\)
0,4------>0,4
\(\Rightarrow\left\{{}\begin{matrix}x=m_{CaCO_3}=0,4.100=40\left(g\right)\\y=m_{b\text{ình}.t\text{ăng}}=m_{CO_2}+m_{H_2O}=0,4.44+0,4.18=24,8\left(g\right)\end{matrix}\right.\)
\(n_{C_2H_4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ PTHH:C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ n_{O_2}=3.0,4=1,2\left(mol\right);n_{CO_2}=0,4.2=0,8\left(mol\right)\\ a,V_{O_2\left(đktc\right)}=22,4.1,2=26,88\left(l\right)\\ b,V_{kk\left(đktc\right)}=\dfrac{100}{20}.26,88=134,4\left(l\right)\\ c,CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow\left(trắng\right)+H_2O\\ n_{CaCO_3}=n_{CO_2}=0,8\left(mol\right)\\ m_{kết.tủa}=m_{CaCO_3}=100.0,8=80\left(g\right)\)
Gọi \(\left\{{}\begin{matrix}n_{CO}=a\left(mol\right)\\n_{CH_4}=b\left(mol\right)\end{matrix}\right.\Rightarrow28a+16b=2,04\left(1\right)\)
\(n_{CaCO_3}=\dfrac{9,6}{100}=0,096\left(mol\right)\)
PTHH: \(2CO+O_2\xrightarrow[]{t^o}2CO_2\)
a------------>a
\(CH_4+2O_2\xrightarrow[]{t^o}CO_2+2H_2O\)
b---------------->b
\(Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3\downarrow+H_2O\)
0,096<--0,096
`=> a + b = 0,096 (2)`
`(1), (2) => a = 0,042; b = 0,054`
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CO}=\dfrac{0,042}{0,042+0,054}.100\%=43,75\%\\\%V_{CH_4}=100\%-43,75\%=56,25\%\end{matrix}\right.\)
nA = 2.8/22.4 = 0.125 (mol)
MA = 1.875 * 22.4 = 42 (g/mol)
=> mA = 42*0.125 = 5.25(g)
nCaCO3 = nCO2 = 37.5/100 = 0.375 (mol)
m bình tăng = mCO2 + mH2O = 23.25 (g)
=> mH2O = 23.25 - 0.375*44 = 6.75(g)
=> nH2O = 6.75/18 = 0.375 (mol)
mO = 5.25 - 0.375*12 - 0.375*2 = 0
CT : CxHy
x = 0.375/0.125 = 3
y = 0.375*2/0.125 = 6
CTPT : C3H6
\(CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\)
\(n_{CO_2} = n_{CaCO_3} = \dfrac{37,5}{100} = 0,375(mol)\\ m_{H_2O} = m_{bình\ tăng} - m_{CO_2} \Rightarrow n_{H_2O} = \dfrac{23,25-0,375.44}{18} = 0,375(mol)\\ m_Y= 1,875.2,8 = 5,25(gam)\\ n_Y = \dfrac{2,8}{22,4} = 0,125(mol)\\ \Rightarrow M_Y = \dfrac{5,25}{0,125} = 42\)
Số nguyên tử Cacbon = \(\dfrac{n_{CO_2}}{n_Y} = \dfrac{0,375}{0,125} = 3\)
Số nguyên tử Hidro = \(\dfrac{2n_{H_2O}}{n_Y} = 6\)
Số nguyên tử Oxi = \(\dfrac{42-12.3-6}{16} = 0\)
Vậy CTPT của Y : C3H6
a)\(n_{CaCO_3}=\dfrac{2}{100}=0,02mol\)
\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)
0,02 0,02
\(CH_4+2O_2\rightarrow CO_2+2H_2O\)
0,02 0,02
\(V_{CH_4}=0,02\cdot22,4=0,448l\)
b) \(V_{CH_4}=90\%V_{tựnhiên}\)
\(\Rightarrow V_{tựnhiên}=\dfrac{V_{CH_4}}{90\%}=\dfrac{0,448}{90\%}\approx0,5l\)
a. PTHH: S + O2 ---to---. SO2 (1)
Ta có: \(n_S=\dfrac{9,6}{32}=0,3\left(mol\right)\)
Theo PT(1): \(n_{SO_2}=n_S=0,3\left(mol\right)\)
=> \(V_{SO_2}=0,3.22,4=6,72\left(lít\right)\)
b. PTHH: SO2 + Ca(OH)2 ---> CaSO3↓ + H2O (2)
Theo PT(2): \(n_{CaSO_3}=n_{SO_2}=0,3\left(mol\right)\)
=> \(m_{CaSO_3}=0,3.120=36\left(g\right)\)
\(n_S=\dfrac{9,6}{32}=0,3\left(mol\right)\)
PTHH: S + O2 ---to→ SO2
Mol: 0,3 0,3
\(V_{SO_2}=0,3.22,4=6,72\left(l\right)\)
PTHH: SO2 + Ca(OH)2 → CaSO3 + H2O
Mol: 0,3 0,3
\(m_{CaSO_3}=0,3.120=36\left(g\right)\)