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mik c.ơn trước
4P+5O2-to>2P2O5
0,04----0,05----0,02
n P=0,04 mol
=>m P2O5=0,02.142=2,84g
=>VO2=0,05.22,4=1,12l
c)
2KMnO4-to>K2MnO4+MnO2+O2
0,1----------------------------------------0,05
H=10%
m KMnO4=0,1.158.110%=17,28g
\(n_P=\dfrac{1,24}{31}=0,04\left(mol\right)\\ pthh:4P+5O_2\underrightarrow{T^O}2P_2O_5\)
0,04 0,05 0,02
=> \(\left\{{}\begin{matrix}m_{P_2O_5}=0,02.142=2,84\left(g\right)\\V_{O_2}=0,05.22,4=1,12\left(l\right)\end{matrix}\right.\)
\(pthh:2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
0,1 0,05
=> \(m_{KMnO_4}=0,1.158=15,8\left(g\right)\)
\(m_{KMnO_4\left(d\text{ùng}\right)}=15,8.110\%=17,38\left(g\right)\)
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: \(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,125mol\\n_P=0,05mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{P_2O_5}=0,05\cdot142=7,1\left(g\right)\\V_{O_2}=0,125\cdot22,4=2,8\left(l\right)\end{matrix}\right.\)
\(n_{KMnO_4}=\dfrac{18.96}{158}=0.12\left(mol\right)\)
\(2KMnO_4\underrightarrow{t^0}K_2MnO_4+MnO_2+O_2\)
\(0.12...........................................0.06\)
\(V_{O_2}=0.06\cdot22.4=1.344\left(l\right)\)
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\)
\(4Al+3O_2\underrightarrow{t^0}2Al_2O_3\)
\(0.08.....0.06.......0.04\)
\(m_{Al\left(dư\right)}=\left(0.2-0.08\right)\cdot27=3.24\left(g\right)\)
\(m_{Al_2O_3}=0.04\cdot102=4.08\left(g\right)\)
a)PTHH: \(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\uparrow\)
b) Ta có: \(n_{KClO_3}=\dfrac{49}{122,5}=0,4\left(mol\right)\) \(\Rightarrow n_{O_2}=0,6\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,6\cdot22,4=13,44\left(l\right)\)
c) PTHH: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
Theo PTHH: \(n_P=\dfrac{4}{5}n_{O_2}=0,48\left(mol\right)\)
\(\Rightarrow m_P=0,48\cdot31=14,88\left(g\right)\)
nP= 0,2(mol)
a) PTHH: 4P + 5 O2 -to-> 2 P2O5
0,2_________0,25_____0,1(mol)
b) V(O2,đktc)=0,25 x 22,4= 5,6(l)
c) mP2O5=142 x 0,1=14,2(g)
\(n_{H_2}=\dfrac{V}{24,79}=\dfrac{11,2}{24,79}\approx0,45\left(mol\right)\)
a) \(PTHH:2H_2+O_2\underrightarrow{t^o}2H_2O\)
2 1 2
0,45 0,225 0,45
b) \(m_{O_2}=n.M=0,225.\left(16.2\right)=7,2\left(g\right)\\ V_{O_2}=n.24,79=0,225.24,79=5,57775\left(l\right)\)
c) \(PTHH:2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2\)
2 1 1 1
0,45 0,225 0,225 0,225
\(m_{KMnO_4}=n.M=0,45.\left(39+55+16.4\right)=71,1\left(g\right).\)
a, \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
b, Ta có: \(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{H_2}=0,25\left(mol\right)\)
\(\Rightarrow m_{O_2}=0,25.32=8\left(g\right)\)
\(V_{O_2}=0,25.22,4=5,6\left(l\right)\)
c, \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
Theo PT: \(n_{KMnO_4}=2n_{O_2}=0,5\left(mol\right)\Rightarrow m_{KMnO_4}=0,5.158=79\left(g\right)\)
a, PT: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
b, Ta có: \(n_{P_2O_5}=\dfrac{7,1}{142}=0,05\left(mol\right)\)
Theo PT: \(n_P=2n_{P_2O_5}=0,1\left(mol\right)\)
\(\Rightarrow m_P=0,1.31=3,1\left(g\right)\)
\(n_{O_2}=\dfrac{5}{2}n_{P_2O_5}=0,125\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,125.22,4=2,8\left(l\right)\)
c, Có: \(V_{O_2\left(dư\right)}=2,8.15\%=0,42\left(l\right)\)
\(\Rightarrow V_{O_2}=2,8+0,42=3,22\left(l\right)\)
\(n_{Al}=\dfrac{m}{M}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ PTHH:4Al+3O_2-^{t^o}>2Al_2O_3\)
tỉ lệ: 4 : 3 : 2
n(mol) 0,2---->0,15---->0,1
\(m_{Al_2O_3}=n\cdot M=0,1\cdot\left(27\cdot2+16\cdot3\right)=10,2\left(g\right)\\ V_{O_2\left(dktc\right)}=n\cdot22,4=0,15\cdot22,4=3,36\left(l\right)\)
câu d đề có thiếu ko ạ?
\(n_{P_2O_5}=\dfrac{7,1}{142}=0,05mol\)
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
0,1 0,125 0,05
\(V_{O_2}=0,125\cdot22,4=2,8l\)
\(m_P=0,1\cdot31=3,1g\)
\(n_{P_2O_5}=\dfrac{7,1}{142}=0,05mol\)
\(4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\)
0,1 0,125 0,05 ( mol )
\(V_{O_2}=0,125.22,4=2,8l\)
\(m_P=0,1.31=3,1g\)
a)
$2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2$
b) $n_{KMnO_4} = \dfrac{79}{158} = 0,5(mol)$
Theo PTHH : $n_{O_2} = \dfrac{1}{2}n_{KMnO_4} = 0,25(mol)$
$\Rightarrow V_{O_2} = 0,25.22,4 = 5,6(lít)$
c) $n_P = \dfrac{3,1}{31} = 0,1(mol)$
$4P + 5O_2 \xrightarrow{t^o} 2P_2O_5$
Ta thấy : $n_P : 4 < n_{O_2} :5$ nên $O_2$ dư
$n_{P_2O_5} = \dfrac{1}{2}n_P = 0,05(mol)$
$m_{P_2O_5} = 0,05.142 = 7,1(gam)$
thank you very much