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a. \(n_{KMnO_4}=\dfrac{47.4}{158}=0,3\left(mol\right)\)
PTHH : 2KMnO4 ---to----> K2MnO4 + MnO2 + O2
0,3 0,15
\(V_{O_2}=0,15.22,4=3,36\left(l\right)\)
b. PTHH : 4Al + 3O2 -> 2Al2O3
0,2 0,15
\(m_{Al}=0,2.27=5,4\left(g\right)\)
1.\(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
0,3 0,1 ( mol )
\(m_{Fe}=0,3.56=16,8g\)
2.\(n_{Cu}=\dfrac{3,2}{64}=0,05mol\)
\(2Cu+O_2\rightarrow\left(t^o\right)2CuO\)
0,05 0,05 ( mol )
\(m_{CuO}=0,05.80=4g\)
3.\(n_{Na}=\dfrac{4,6}{23}=0,2mol\)
\(4Na+O_2\rightarrow\left(t^o\right)2Na_2O\)
0,2 0,05 ( mol )
\(V_{O_2}=0,05.24,79=1,2395l\)
4.\(n_{Cu}=\dfrac{1,6}{64}=0,025mol\)
\(2Cu+O_2\rightarrow\left(t^o\right)2CuO\)
0,025 0,0125 ( mol )
\(V_{O_2}=0,0125.24,79=0,309875l\)
\(a,PTHH:4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\\ b,n_{Al_2O_3}=\dfrac{30,6}{102}=0,3\left(mol\right)\\ n_{Al}=\dfrac{4}{2}.n_{Al_2O_3}=2.0,3=0,6\left(mol\right)\\ \Rightarrow m_{Al}=0,6.27=16,2\left(g\right)\\ c,n_{O_2}=\dfrac{3}{2}.n_{Al_2O_3}=\dfrac{3}{2}.0,3=0,45\left(mol\right)\\ \Rightarrow V_{O_2\left(đkc\right)}=0,45.24,79=11,1555\left(l\right)\)
a, \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, \(nAl_2O_3=\dfrac{30,6}{102}=0,3\left(mol\right)\)
\(nAl=\dfrac{4}{2}.0,3=0,6\left(mol\right)\)
\(mAl=0,6.27=16,2\left(g\right)\)
c, \(nO_2=\dfrac{3}{2}.0,3=0,45\left(mol\right)\)
\(VO_{2\left(đkc\right)}=0,45.24,79=11,1555\left(l\right)\)
n C3H8=0,1 mol
C3H8+5O2-to>3CO2+4H2O
0,1-----0,5------------0,3-----0,4 mol
=>VCO2=0,3.22,4=6,72 l
=>VO2=0,5.22,4=11,2l
PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
Ta có: \(n_{CH_4}=\dfrac{30,9875}{24,79}=1,25\left(mol\right)\)
a, \(n_{H_2O}=2n_{CH_4}=2,5\left(mol\right)\) \(\Rightarrow m_{H_2O}=2,5.18=45\left(g\right)\)
b, \(n_{O_2}=2n_{CH_4}=2,5\left(mol\right)\) \(\Rightarrow V_{O_2}=2,5.24,79=61,975\left(l\right)\)
Mà: O2 chiếm 1/5 thể tích không khí.
\(\Rightarrow V_{kk}=5V_{O_2}=309,875\left(l\right)\)
\(n_P=\dfrac{0,62}{31}=0,02\left(mol\right)\\ 4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\\ n_{P_2O_5}=\dfrac{2}{4}.0,02=0,01\left(mol\right);n_{O_2}=\dfrac{5}{4}.0,02=0,025\left(mol\right)\\ V_{O_2\left(đkc\right)}=0,025.24,79=0,61975\left(l\right)\\ m_{P_2O_5}=142.0,01=1,42\left(g\right)\)
\(n_P=\dfrac{m}{M}=\dfrac{0,62}{31}=0,02mol\)
PTHH: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
4 5 2 ( mol )
0,02 0,025 0,01 ( mol )
\(V_{O_2}=n_{O_2}.22,4=0,025.22,4=0,56l\)
\(m_{P_2O_5}=n_{P_2O_5}.M_{P_2O_5}=0,01.142=1,42g\)