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\(n_{O_2}=\dfrac{8}{32}=0.25\left(mol\right)\)
\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)
\(0.125....0.25....0.125\)
\(m_{CH_4}=0.125\cdot16=2\left(g\right)\)
\(V_{CO_2}=0.125\cdot22.4=2.8\left(l\right)\)
\(Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\)
\(............0.125.....0.125\)
\(m_{CaCO_3}=0.125\cdot100=12.5\left(g\right)\)
a) C2H5OH + 3O2 --to--> 2CO2 + 3H2O
b) \(n_{C_2H_5OH}=\dfrac{46}{46}=1\left(mol\right)\)
PTHH: C2H5OH + 3O2 --to--> 2CO2 + 3H2O
1----->3----------->2------->3
=> VO2 = 22,4.3 = 67,2 (l)
c) mH2O = 3.18 = 54 (g)
d) VCO2 = 2.22,4 = 44,8 (l)
a: \(C+O_2\rightarrow CO_2\)(ĐK: t độ)
b: \(n_C=n_{CO_2}=\dfrac{2.4}{12}=0.2\left(mol\right)\)
\(m_{CO_2}=0.2\cdot44=8.8\left(g\right)\)
c: \(n_{O_2}=0.2\left(mol\right)\)
\(\Leftrightarrow V_{O_2}=4.48\left(lít\right)\)
hay \(V_{KK}=22.4\left(lít\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\
pthh:CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
0,2 0,4 0,4
\(V_{O_2}=0,4.22,4=8,96\left(l\right)\\
m_{H_2O}=0,4.18=7,2\left(g\right)\)
1) \(C+O_2\rightarrow CO_2\\
C+CO_2\rightarrow2CO\)
2)
\(pthh:C+O_2\rightarrow CO_2\)
=> số mol bằng nhau
\(n_{O_2}=\dfrac{6,4}{16}=0,4\left(mol\right)\)
áp vào pt trên ta có : nCO2 = 0,4 (mol)
=> \(m_{CO_2}=0,4.44=17,6\left(g\right)\)
=> dCO2/H2 = 44/2 = 22
dCO2/H2 = 44/2 = 22
PTHH: \(C+O_2\underrightarrow{t^o}CO_2\)
nC = 1,2 / 12 = 0,1 (mol)
nO2 = 2,24 / 22,4 = 0,1 mol
=> nCO2 = nC = nO2 = 0,1 mol
=> VCO2(đktc) = 0,1 x 22,4 = 2,24 lít
PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)
a, Giả sử: \(\left\{{}\begin{matrix}n_{CH_4}=x\left(mol\right)\\n_{C_2H_2}=y\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow x+y=\dfrac{22,4}{22,4}=1\left(mol\right)\left(1\right)\)
Ta có: \(n_{CO_2}=\dfrac{35,84}{22,4}=1,6\left(mol\right)\)
Theo PT: \(\Sigma n_{CO_2}=n_{CH_4}+2n_{C_2H_2}\)
\(\Rightarrow x+2y=1,6\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,4\left(mol\right)\\y=0,6\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,4}{1}.100\%=40\%\\\text{ }\%V_{C_2H_2}=60\%\end{matrix}\right.\)
b, Theo PT: \(\Sigma n_{O_2}=2n_{CH_4}+\dfrac{5}{2}n_{C_2H_2}=2,3\left(mol\right)\)
\(\Rightarrow m_{O_2}=2,3.32=73,6\left(g\right)\)
c, PT: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
Theo PT: \(n_{Na_2CO_3}=n_{CO_2}=1,6\left(mol\right)\)
\(\Rightarrow C_{M_{Na_2CO_3}}=\dfrac{1,6}{0,8}=2M\)
Bạn tham khảo nhé!
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: \(n_{O_2}=2.n_{CH_4}=0,1\left(mol\right)\Rightarrow V_{O_2\left(đktc\right)}=2,24\left(l\right)\)
C+O2→CO2
+nC=\(\dfrac{4,8}{12}=0,4\left(mol\right)\)
+Theo PTHH ta có:
-nCO2=nC=0,4(mol)
+mCO2=0,4.44=17,6(gam)