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nCO2=0,2mol
PTHH: 2CO+O2=>2CO2
0,2<--0,1<---0,2
=> mO2=0,2.32=6,4g
=> khối lượng Oxi phản ứng với H2 là :
9,6-6,4=3,2g
=> nH2O=3,2:32=0,1mol
PTHH: 2H+O2=>H2O
0,2<-0,1<-0,2
=> mH2=2.0,2=0,4g
mCO =0,2.28=5,6g
=> m hh=5,6+0,4=6g
PTHH: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
Ta có: \(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
\(\Rightarrow n_{O_2}=0,5\left(mol\right)\) \(\Rightarrow V_{O_2}0,5\cdot22,4=11,2\left(l\right)\)
a) \(4P+5O_2\underrightarrow{t\text{°}}P_2O_5\)
b)\(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
Từ PTHH: \(n_{O_2}=\dfrac{5}{4}n_P=\dfrac{5}{4}.0,4=0,5\left(mol\right)\)
\(\Rightarrow\)\(V_{O_2}=0,5.22,4=11,2\left(l\right)\)
\(n_{CO_2}=\dfrac{8.8}{44}=0.2\left(mol\right)\)
\(n_{O_2}=\dfrac{9.6}{32}=0.3\left(mol\right)\)
\(2CO+O_2\underrightarrow{t^0}2CO_2\)
\(0.2.......0.1.......0.2\)
\(2H_2+O_2\underrightarrow{t^0}2H_2O\)
\(0.4......0.3-0.1\)
\(\%m_{CO}=\dfrac{0.2\cdot28}{0.2\cdot28+0.4\cdot2}\cdot100\%=87.5\%\)
\(\%m_{H_2}=100-87.5=12.5\%\)
a)
\(2CO + O_2 \xrightarrow{t^o} 2CO_2(1)\\ 2H_2 + O_2 \xrightarrow{t^o} 2H_2O(2) \)
b)
\(n_{CO_2} = \dfrac{8,8}{44} = 0,2(mol)\\ n_{O_2} = \dfrac{9,6}{32} = 0,3(mol)\)
Theo PTHH :
\(n_{CO} = n_{CO_2} = 0,2(mol)\\ n_{O_2(1)} = \dfrac{1}{2}n_{CO_2} = 0,1(mol)\\ n_{H_2} = 2n_{O_2(2)} = 2(0,3-0,1) = 0,4(mol)\)
Vậy :
\(\%m_{CO} = \dfrac{0,2.28}{0,2.28+0,4.2}.100\% = 87,5\%\\ \%m_{H_2} = 100\% - 87,5\% = 12,5\%\)
\(CO+\dfrac{1}{2}O_2\underrightarrow{to}CO_2\\ H_2+\dfrac{1}{2}O_2\underrightarrow{to}H_2O\\ n_{O_2}=\dfrac{1}{2}.\left(n_{CO}+n_{H_3}\right)=\dfrac{0,3}{2}=0,15\left(mol\right)\\ V=V_{O_2\left(đktc\right)}=0,15.22,4=3,36\left(l\right)\)
a)
\(4P + 5O_2 \xrightarrow{t^o} 2P_2O_5\)
b)
Ta có : \(n_P = \dfrac{3,1}{31} = 0,1(mol)\)
Theo PTHH :
\(n_{P_2O_5} = 0,5n_P = 0,05(mol)\\ n_{O_2} = \dfrac{5}{4}n_P = 0,125(mol)\)
Suy ra :
\(m_{P_2O_5} = 0,05.142 = 7,1(gam)\\ V_{O_2} = 0,125.22,4 = 2,8(lít)\)
a) PTHH: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
b) Ta có: \(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,125mol\\n_P=0,05mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{P_2O_5}=0,05\cdot142=7,1\left(g\right)\\V_{O_2}=0,125\cdot22,4=2,8\left(l\right)\end{matrix}\right.\)
4FeS2 + 11O2 => 2 Fe2O3 + 8SO2
SO2 +Ba(OH)2=> BaSO3 + H2O
0,15 mol<=0,15 mol
2SO2 +Ba(OH)2 => Ba(HSO3)2
x mol=>0,5x mol=>0,5x mol
mBa(OH)2=85,5 gam=>nBa(OH)2=0,5 mol
nBaSO3=0,15 mol
=>x=0,7 mol
tổng nSO2=0,7+0,15=0,85 mol =>nFeS2=0,425 mol=>m=0,425.120=51 gam
mdd X=0,7.64+200-32,55=212,25 gam
mBa(HSO3)2=0,5.0,7.299=104,65 gam
C% dd X=104,65/212,25.100%=49,31%
$n_{CO_2} = \dfrac{8,8}{44} = 0,2(mol)$
\(2CO+O_2\xrightarrow[]{t^o}2CO_2\)
0,2 0,1 0,2 (mol)
$n_{O_2} = \dfrac{9,6}{32} = 0,3(mol)$
\(2H_2+O_2\xrightarrow[]{t^o}2H_2O\)
0,4 0,2 0,2 (mol)
\(\%m_{CO}=\dfrac{0,2.44}{0,2.44+0,4.2}.100\%=91,67\%\\ \%m_{H_2}=100\%-91,67\%=8,33\%\)
\(\%n_{CO}=\dfrac{0,2}{0,2+0,4}.100\%=33,33\%\\ \%n_{H_2}=100\%-33,33\%=66,67\%\)
\(n_{H_2\left(ĐKTC\right)}=\frac{V}{22,4}=\frac{8,96}{22,4}=0,4mol\)
PTHH: \(2H_2+O_2\rightarrow^{t^o}2H_2O\)
\(\rightarrow n_{H_2O}=n_{H_2}=0,4mol\)
\(\rightarrow m_{H_2O}=n.M=0,4.18=7,2g\)
\(n_{H_2}=\frac{V}{22,4}=\frac{8,96}{22,4}=0,4mol\)
\(2H_2+O_2\rightarrow^{t^o}2H_2O\)
\(n_{H_2O}=n_{H_2}=0,4mol\)
\(\rightarrow m_{H_2O}=n\cdot M=0,4\cdot18=7,2g\)