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\(a.C_2H_5OH+3O_2-^{t^o}\rightarrow2CO_2+3H_2O\\ n_{C_2H_5OH}=0,3\left(mol\right)\\ n_{CO_2}=2n_{C_2H_5OH}=0,6\left(mol\right)\\ \Rightarrow V_{CO_2}=0,6.22,4=13,44\left(l\right)\\ b.n_{O_2}=3n_{C_2H_5OH}=0,6\left(mol\right)\\ MàV_{O_2}=\dfrac{1}{5}V_{kk}\\ \Rightarrow V_{kk}=V_{O_2}.5=0,6.22,4.5=67,2\left(l\right)\\ c.n_{NaOH}=0,9\left(mol\right)\\ Tacó:\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,9}{0,6}=1,5\\ \Rightarrow Tạora2muốiNaHCO_3vàNa_2CO_3\\ Đặt:n_{NaHCO_3}=x\left(mol\right);n_{Na_2CO_3}=y\left(mol\right)\\ \Rightarrow\left\{{}\begin{matrix}x+y=0,6\left(BTnguyento\left(C\right)\right)\\x+2y=0,9\left(BTnguyento\left(Na\right)\right)\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=0,3\\y=0,3\end{matrix}\right.\\ \Rightarrow m_{muối}=0,3.84+0,3.106=57\left(g\right)\)
\(n_{C_2H_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\\ C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ a,n_{O_2}=3.0,5=1,5\left(mol\right)\\ V_{O_2\left(đktc\right)}=1,5.22,4=33,6\left(l\right)\\ V_{kk\left(đktc\right)}=33,6.5=168\left(l\right)\\ b,n_{CO_2}=n_{H_2O}=2.0,5=1\left(mol\right)\\ m_{CO_2}=44.1=44\left(g\right);m_{H_2O}=18.1=18\left(g\right)\\ c,CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\\ n_{Ca\left(OH\right)_2}=n_{CO_2}=1\left(mol\right)\\ m_{Ca\left(OH\right)_2}=1.74=74\left(g\right)\\ m_{ddCa\left(OH\right)_2}=\dfrac{74.100}{10}=740\left(g\right)\)
nCH4 = 2,24/22,4 = 0,1 (mol)
PTHH: CH4 + 2O2 -> (t°) CO2 + 2H2O
0,1 ---> 0,2 ---> 0,1
VO2 = 0,2 . 22,4 = 4,48 (l)
VCO2 = 0,1 . 22,4 = 2,24 (l)
nCH4 = 2,24 : 22,4 = 0,1 (mol)
pthh : CH4 + 2O2 --t---> CO2 + 2H2O
0,1---> 0,2--------->0,1 (mol)
=> VO2 = 0,2 . 22,4 = 4,48 (L)
=> VCO2 = 0,1 . 22,4 = 2,24 (L)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PTHH :
2Mg + O2 -- > 2 MgO
0,2 0,1 0,2 (mol )
\(a,m_{MgO}=0,2.40=8\left(g\right)\)
\(b,V_{O_2}=0,1.22,4=2,24\left(l\right)\)
\(c,V_{kk}=2,24.5=11,2\left(l\right)\)
PTHH: \(C_2H_5OH+3O_2\xrightarrow[]{t^o}2CO_2+3H_2O\)
Ta có: \(n_{C_2H_5OH}=\dfrac{6,4}{46}=\dfrac{16}{115}\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=\dfrac{48}{115}\left(mol\right)\\n_{CO_2}=\dfrac{32}{112}\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=\dfrac{48}{115}\cdot22,4\approx9,35\left(l\right)\\V_{CO_2}=\dfrac{32}{112}\cdot22,4\approx6,23\left(l\right)\end{matrix}\right.\)
Bài 2:
\(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
PTHH: 4P + 5O2 → 2P2O5
Mol: 0,4 0,2
\(m_{P_2O_5}=0,2.142=28,4\left(g\right)\)
Bài 1:
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
PTHH: 4Al + 3O2 ---to→ 2Al2O3
Mol: 0,4 0,3
\(V_{O_2}=0,3.22,4=6,72\left(l\right)\)
???Chất gì