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a) \(n_{C_4H_{10}}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)
PTHH: 2C4H10 + 13O2 --to--> 8CO2 + 10H2O
0,4---->2,6---------->1,6------->2
=> m = 1,6.44 = 70,4 (g)
b) \(V_{O_2}=2,6.22,4=58,24\left(l\right)\)
c) \(n_P=\dfrac{9,1}{31}=\dfrac{91}{310}\left(mol\right)\)
PTHH: 4P + 5O2 --to--> 2P2O5
Xét tỉ lê \(\dfrac{\dfrac{91}{310}}{4}< \dfrac{2,6}{5}\) => P hết, O2 dư
\(m_{P_2O_5}=\dfrac{91}{620}.142=\dfrac{6461}{310}\left(g\right)\)
Tên sản phẩm: Điphotpho pentaoxit
16nmetan+58nbutan=7,4 (1).
BT C: nmetan+4nbutan=22/44=0,5 (2).
Giải hệ phương trình gồm (1) và (2), ta suy ra nmetan=0,1 (mol) và nbutan=0,1 (mol).
Số mol nước tạo ra là 0,5.(0,1.4+0,1.10)=0,7 (mol).
BTKL: 7,4+32nkhí oxi=22+0,7.18, suy ra nkhí oxi=0,85 (mol).
Thể tích khí oxi cần tìm là 0,85.22,4=19,04 (lít).
\(n_{CO_2}=\dfrac{22}{44}=0,5mol\)
Gọi \(\left\{{}\begin{matrix}n_{CH_4}=x\\n_{C_4H_{10}}=y\end{matrix}\right.\)
\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)
x 2x x ( mol )
\(2C_4H_{10}+13O_2\rightarrow\left(t^o\right)8CO_2+10H_2O\)
y 13/2 y 4y ( mol )
Ta có:
\(\left\{{}\begin{matrix}16x+58y=7,4\\x+4y=0,5\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)
\(\Rightarrow n_{O_2}=2.0,1+\dfrac{13}{2}.0,1=0,85mol\)
\(V_{O_2}=0,85.22,4=19,04l\)
Theo gt ta có: $n_{C_4H_{10}}=0,3(mol)$
$C_4H_{10}+\frac{13}{2}O_2\rightarrow 4CO_2+5H_2O$
Ta có: $n_{O_2}=1,95(mol)\Rightarrow V_{O_2}=43,68(l)$
\(a,PTHH:2C_4H_{10}+13O_2\underrightarrow{t^o}8CO_2+10H_2O\\ b,n_{C_4H_{10}}=\dfrac{m}{M}=\dfrac{2,9}{58}=0,05\left(mol\right)\\ Theo.PTHH:n_{H_2O}=5.n_{C_4H_{10}}=5.0,05=0,25\left(mol\right)\\ m_{H_2O}=n.M=0,25.18=4,5\left(g\right)\)
\(c,Theo.PTHH:n_{O_2}=\dfrac{13}{2}.n_{C_4H_{10}}=\dfrac{13}{2}.0,05=0,325\left(mol\right)\\ V_{O_2\left(đktc\right)}=n.22,4=0,325.22,4=7,28\left(l\right)\\ d,PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ Theo.PTHH:n_{Fe_3O_4}=\dfrac{1}{2}.n_{O_2}=\dfrac{1}{2}.0,325=0,1625\left(mol\right)\\ m_{Fe_3O_4}=n.M=0,1625.232=37,7\left(g\right)\)
a) C + O2 --to--> CO2
b) \(n_C=\dfrac{2,4}{12}=0,2\left(mol\right)\)
PTHH: C + O2 --to--> CO2
_____0,2->0,2------>0,2
=> mCO2 = 0,2.44 = 8,8 (g)
c) VO2 = 0,2.22,4 = 4,48(l)
=> Vkk = 4,48.5 = 22,4 (l)
a.\(n_{C_4H_{10}}=\dfrac{4,48}{22,4}=0,2mol\)
\(2C_4H_{10}+13O_2\rightarrow\left(t^o\right)8CO_2+10H_2O\)
0,2 1,3 ( mol )
\(V_{O_2}=1,3.22,4=29,12l\)
\(V_{kk}=29,12.5=145,6l\)
b.\(2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\)
2,6 1,3 ( mol )
\(m_{KMnO_4}=2,6.158=410,8g\)
\(n_{C_4H_{10}}=\dfrac{4,48}{22,4}=0,2\left(MOL\right)\\
pthh:2C_2H_{10}+13O_2\underrightarrow{t^o}8CO_2+10H_2O\)
0,2 1,3
=> \(V_{O_2}=1,3.22,4=29,12\left(l\right)\\
V_{kk}=29,12:20\%=145,6\left(l\right)\\
pthh:2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
2,6 1,3
=> \(m_{KMnO_4}=2,6.158=410,8\left(g\right)\)
\(n_{O_2}=\dfrac{1456:1000}{22,4}=0,065\left(mol\right)\\ a,2C_4H_{10}+13O_2\rightarrow\left(t^o\right)8CO_2+10H_2O\\ b,n_{CO_2}=\dfrac{8}{13}.0,065=0,04\left(mol\right)\\ n_{H_2O}=\dfrac{10}{13}.0,065=0,05\left(mol\right)\\ b,m_{sp}=m_{CO_2}+m_{H_2O}=44.0,04+18.0,05=2,66\left(g\right)\\ c,n_{C_4H_{10}}=\dfrac{2}{13}.0,065=0,01\left(mol\right)\\ V_{gas}=\dfrac{100}{80}.0,01.22,4=0,28\left(l\right)\)