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\(n_C=0,5\left(mol\right)\\ C+O_2\rightarrow\left(t^o\right)CO_2\\ n_{O_2}=n_C=0,5\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,5.22,4=11,2\left(l\right)\\ Mà:V_{O_2}=\dfrac{1}{5}V_{kk}\Leftrightarrow V_{kk}=5.V_{O_2}=5.11,2=56\left(lít\right)\)
Câu 1:
\(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: C + O2 --to--> CO2
0,15<-----------0,15
=> \(\%C=\dfrac{0,15.12}{2}.100\%=90\%\)
Câu 2:
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,2<-------------------0,3
=> mAl = 0,2.27 = 5,4 (g)
Câu 1.
\(n_{CO_2}=\dfrac{3,36}{22,4}=0,15mol\)
\(C+O_2\underrightarrow{t^o}CO_2\)
0,15 0,15
\(m_C=0,15\cdot12=1,8g\)
\(\%C=\dfrac{1,8}{2}\cdot100\%=90\%\)
Câu 2.
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,2 0,3
\(m_{Al}=0,2\cdot27=5,4g\)
C+O2-to>CO2
1,5--1,5 -----1,5mol
n C=\(\dfrac{18}{12}\)=1,5 mol
=>Vkk=1,5.22,4.5=168l
=>VCO2=1,5.22,4=33,6l
nC = 18/12 = 1,5 (mol)
PTHH: C + O2 -> (t°) CO2
Mol: 1,5 ---> 1,5 ---> 1,5
VO2 = 1,5 . 22,4 = 33,6 (l)
Vkk = 33,6 . 5 = 168 (l)
VCO2 = 1,5 . 22,4 = 33,6 (l)
\(n_S=\dfrac{3.2}{32}=0.1\left(mol\right)\)
\(n_{O_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)
\(S+O_2\underrightarrow{t^0}SO_2\)
\(0.05.0.05...0.05\)
\(\Rightarrow Sdư\)
\(V_{SO_2}=0.05\cdot22.4=1.12\left(l\right)\)
\(b.\)
\(S+O_2\underrightarrow{t^0}SO_2\)
\(0.1..0.1\)
\(V_{kk}=5V_{O_2}=5\cdot0.1\cdot22.4=11.2\left(l\right)\)
a, PT: \(S+O_2\underrightarrow{t^o}SO_2\)
Ta có: \(n_S=\dfrac{3,2}{32}=0,1\left(mol\right)\)
\(n_{O_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\), ta được S dư.
Theo PT: \(n_{SO_2}=n_{O_2}=0,05\left(mol\right)\) \(\Rightarrow V_{SO_2}=0,05.22,4=1,12\left(l\right)\)
b, Theo PT: \(n_{O_2}=n_S=0,1\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,1.22,4=2,24\left(l\right)\)
\(\Rightarrow V_{kk}=2,24.5=11,2\left(l\right)\)
a, Theo giả thiết ta có: \(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)
\(4P+5O_2--t^o->2P_2O_5\)
Ta có: \(n_{O_2}=\dfrac{5}{4}.n_P=0,125\left(mol\right)\Rightarrow V_{O_2\left(đktc\right)}=0,125.22,4=2,8\left(l\right)\)
b, Theo giả thiết ta có: \(n_{CH_4}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
\(CH_4+2O_2--t^o->CO_2+2H_2O\)
Ta có: \(n_{O_2}=2.n_{CH_4}=0,1\left(mol\right)\Rightarrow V_{O_2\left(đktc\right)}=2,24\left(l\right)\)
BTKL: \(m_{S+C}+m_{O_2}=m_{SO_2+CO_2}\)
\(\Rightarrow m_{O_2}=15,2-5,6=9,6g\)
\(\Rightarrow n_{O_2}=0,3mol\)
\(\Rightarrow V_{O_2}=0,3\cdot22,4=6,72l\)
\(\Rightarrow V_{kk}=5\cdot6,72=33,6l\)
\(n_C=\dfrac{2.4}{12}=0.2\left(mol\right)\)
\(n_{O_2}=\dfrac{4.8}{32}=0.15\left(mol\right)\)
\(C+O_2\underrightarrow{t^0}CO_2\)
\(....0.15...0.15\)
\(V_{CO_2}=0.15\cdot22.4=3.36z9l\)
theo Mk là nó như thế này... 
\(n_C=\dfrac{1.2}{12}=0.1\left(mol\right)\)
\(C+O_2\underrightarrow{^{^{t^0}}}CO_2\)
\(0.1.....0.1\)
\(V_{O_2}=0.1\cdot22.4=2.24\left(l\right)\)
nC=1,2/12=0,1(mol)
PTHH:C + O2 -to-> CO2
0,1________0,1____0,1
V(O2,đktc)=0,1 x 22,4=2,24(l)