Ta có: \(n_{O_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)

PT: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)

a, \(n_P=\dfrac{4}{5}n_{O_2}=0,08\left(mol\right)\Rightarrow m_P=0,08.31=2,48\left(g\right)\)

b, \(n_{P_2O_5}=\dfrac{2}{5}n_{O_2}=0,04\left(mol\right)\Rightarrow m_{P_2O_5}=0,04.142=5,68\left(g\right)\)

\(n_{O_2}=\dfrac{2.479}{22.4}=0.1\left(mol\right)\)\(n_{O_2}=\dfrac{2.479}{24.79}=0.1\left(mol\right)\)

\(4P+5O_2\underrightarrow{^{^{t^o}}}2P_2O_5\)

\(0.08....0.1......0.04\)

\(a.m_P=0.08\cdot31=2.48\left(g\right)\)

\(b.m_{P_2O_5}=0.04\cdot142=5.68\left(g\right)\)

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          
=> \(m_{KMnO_4}=0,1.158=15,8\left(g\right)\) 
\(m_{KMnO_4\left(d\text{ùng}\right)}=15,8.110\%=17,38\left(g\right)\)

\(n_{CO_2}=\dfrac{4.4}{44}=0.1\left(mol\right)\)

\(CH_4+2O_2\underrightarrow{^{^{t^0}}}CO_2+2H_2O\)

\(0.1.......0.2........0.1..........0.2\)

\(m_{CH_4}=0.1\cdot16=1.6\left(g\right)\)

\(V_{H_2O}=0.2\cdot22.4=4.48\left(l\right)\)

\(V_{kk}=5V_{O_2}=5\cdot0.2\cdot22.4=22.4\left(l\right)\)

a) 4P + 5O₂ --t^o--> 2P₂O₅

b) \(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\)

PTHH: 4P + 5O₂ --t^o--> 2P₂O₅

           0,2-->0,25------->0,1

=> m_P2O5 = 0,1.142 = 14,2(g)

c) V_O2 = 0,25.22,4 = 5,6(l)

a, \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)

b, Sửa đề: 17,9 (l) → 17,92 (l)

Ta có: \(n_{CO_2}=\dfrac{17,92}{22,4}=0,8\left(mol\right)=n_C\)

\(n_{H_2O}=\dfrac{18}{18}=1\left(mol\right)\Rightarrow n_H=1.2=2\left(mol\right)\)

⇒ m_A = m_C + m_H = 0,8.12 + 2.1 = 11,6 (g)

Theo ĐLBT KL, có: m_A + m_O2 = m_CO2 + m_H2O

⇒ m_O2 = 0,8.44 + 18 - 11,6 = 41,6 (g)

\(\Rightarrow n_{O_2}=\dfrac{41,6}{32}=1,3\left(mol\right)\Rightarrow V_{O_2}=1,3.22,4=29,12\left(l\right)\)

\(S+O_2\underrightarrow{t^o}SO_2\)

\(1:1:1:1\)

\(0,2:0,2:0,2:0,2\left(mol\right)\)

\(n_{SO_2}=\dfrac{V}{24,79}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)

\(a,m_S=n.M=0,2.32=6,4\left(g\right)\)

\(b,V_{O_2}=n.24,79=0,2.24,79=4,958\left(l\right)\)

làm lại ko để ý có điều kiện=))))

\(n_{SO_2\left(dkc\right)}=\dfrac{V}{24,79}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)

\(PTHH:S+O_2-^{t^o}>SO_2\)

tỉ lệ        1   :     1     :     1

n(mol)  0,2<--0,2<---0,2

\(m_S=n\cdot M=0,2\cdot32=6,4\left(g\right)\\ V_{O_2\left(dkc\right)}=n\cdot24,79=0,2\cdot24,79=4,958\left(l\right)\)

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: \(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,125mol\\n_P=0,05mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{P_2O_5}=0,05\cdot142=7,1\left(g\right)\\V_{O_2}=0,125\cdot22,4=2,8\left(l\right)\end{matrix}\right.\)

1. PTHH: 4P + 5O₂  2P₂O₅

2. 

Từ PT  nO2=0,125(mol);nP2O5=0,05(mol)

đktc: VO2=0,125.22,4=2,8(l)

3. mP2O5=0,05.142=7,1(g)