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

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

a, Theo PT: \(n_{O_2}=\dfrac{5}{4}n_P=0,125\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,125.22,4=2,8\left(l\right)\)

b, Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,05\left(mol\right)\)

\(\Rightarrow m_{P_2O_5}=0,05.142=7,1\left(g\right)\)

Bạn tham khảo nhé!

\(n_P=\dfrac{3.1}{31}=0.1\left(mol\right)\)

\(4P+5O_2\underrightarrow{t^0}2P_2O_5\)

\(0.1...0.125....0.05\)

\(V_{O_2}=0.125\cdot22.4=2.8\left(l\right)\)

\(m_{P_2O_5}=0.05\cdot142=7.1\left(g\right)\)

PTHH : 4P + 5\(O_2\) -> 2\(P_2O_5\)

a) nP = m / M = 0.1(mol)

có : nP = 5/4 n\(O_2\)

    -> n\(O_2\) = 0.125 (mol)

   -> V\(O_2\) (đktc) = n.22.4 = 2.8 (L)

b) có : nP = 1/2 n\(P_2O_5\)

   -> n\(P_2O_5\) = 0.05 (mol)

   -> m\(P_2O_5\) = n.M = 7.1 (g)

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

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

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

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

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

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

nP= 7,44/31=0,24(mol)

nO2=6,16/22,4=0,275(mol)

PTHH:4 P + 5 O2 -to->2  P2O5

Ta có: 0,24/4 > 0,275/5

=> O2 hết, P dư, tính theo nO2

nP(p.ứ)= 0,275 x 4/5= 0,22(mol)

=>nP(dư)=0,24-0,22=0,02(mol)

=>mP(dư)=0,02.31= 0,62(g)

nP2O5= 2/5 x 0,275= 0,11(mol)

=> mP2O5= 142 x 0,11= 15,62(g)

\(n_P=\dfrac{7,44}{31}=0,24\left(mol\right)\)

\(n_{O_2}=\dfrac{6,16}{22,4}=0,275\left(mol\right)\)

PTHH :                       \(4P+5O_2\rightarrow2P_2O_5\)

Ban đầu :                0,24    0,275                   (mol)

Phản ứng :             0,22    0,275       0,11    (mol)

Sau phản ứng :      0,02      0            0,11    (mol)

\(m_P=0,02.31=0,62\left(g\right)\)

\(m_{P_2O_5}=0,11.142=15,62\left(g\right)\) 

a, PT: \(S+O_2\underrightarrow{t^o}SO_2\)

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

b, Ta có: \(n_{SO_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)

Theo PT: \(n_S=n_{SO_2}=0,1\left(mol\right)\)

⇒ m_P = 6,3 - m_S = 6,3 - 0,1.32 = 3,1 (g)

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

Theo PT: \(n_{O_2}=n_S+\dfrac{5}{4}n_P=0,225\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,225.24,79=5,57775\left(l\right)\)

c, Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,05\left(mol\right)\)

\(\Rightarrow m_{P_2O_5}=0,05.142=7,1\left(g\right)\)

\(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)

\(n_{O_2}=\dfrac{13,4}{22,4}\approx0,6\left(mol\right)\)

PTHH : 4P + 5O₂ -> 2P₂O₅

             0,4     0,5

 Xét tỉ lệ : \(\dfrac{0,4}{4}< \dfrac{0,6}{5}\) => O₂ dư , P đủ

b. \(m_{O_2\left(dư\right)}=\left(0,6-0,5\right).32\approx3,2\left(g\right)\)

c. \(m_{P_2O_5}=0,05.142=7,1\left(g\right)\)

a) 4P + 5O₂ \(\rightarrow\) 2P₂O₅.

b) Lượng photpho và oxi ban đầu lần lượt là 0,4 mol và 13,4/22,4\(\approx\)0,5982 mol (nếu ở đktc). Suy ra, oxi dư và dư khoảng 0,0982 mol (nếu ở đktc).

c) Lượng điphotpho pentaoxit tạo ra là 0,2 mol.

Khối lượng cần tìm là 0,2.142=28,4 (g). 

\(a,n_{hh\left(CH_4,C_2H_4,C_2H_2\right)}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ n_{CH_4}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ n_{hh\left(C_2H_4,C_2H_2\right)}=0,4-0,1=0,3\left(mol\right)\)

Gọi \(\left\{{}\begin{matrix}n_{C_2H_4}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\)

=> \(\left\{{}\begin{matrix}a+b=0,3\\28a+26b=8,1\end{matrix}\right.\Leftrightarrow a=b=0,15\left(mol\right)\)

PTHH:

\(CH\equiv CH+2Br-Br\rightarrow CHBr_2-CHBr_2\)

\(CH_2=CH_2+Br-Br\rightarrow CH_2Br-CH_2Br\)

\(b,\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,1}{0,4}.100\%=25\%\\\%V_{C_2H_4}=\%V_{C_2H_2}=\dfrac{0,15}{0,4}.100\%=37,5\%\end{matrix}\right.\)

c, PTHH:

\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\\ C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^o}2CO_2+H_2O\\ C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\\ Ba\left(OH\right)_2+CO_2\rightarrow BaCO_3\downarrow+H_2O\\ \rightarrow n_{BaCO_3}=n_{CO_2}=0,1+0,15.0,15.2=0,7\left(mol\right)\\ m_{BaCO_3}=0,7.197=137,9\left(g\right)\)

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

\(PTHH:4P+5O_2-^{t^o}>2P_2O_5\)

tỉ lệ           4   :     5    :       2

n(mol)    0,2---->0,25---->0,1

`V(O_2)=nxx24,79=0,25xx24,79=6,1975(l)`

`V(kk)=6,1975:1/5=30,9875(l)`

a) nP=0,1(mol)

PTHH: 4P + 5 O2 -to-> 2 P2O5

nO2= 5/4 . nP=5/4. 0,1= 0,125(mol)

=> V(O2,dktc)=0,125.22,4=2,8(l)

b) nP2O5= nP/2= 0,1/2= 0,05(mol)

=>mP2O5=142.0,05=7,1(g)

Khối lượng khí Oxi đã phản ứng là:

   ^mP₂O₅ = ^mP + ^mO₂ 

   28,4 = 12,4 + ^mO₂

   ^mO₂ = 28,4 - 12,4

  ^mO₂ = 16 g