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a, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
b, \(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,2\left(mol\right)\Rightarrow m_{P_2O_5}=0,2.142=28,4\left(g\right)\)
c, \(n_{O_2}=\dfrac{5}{4}n_P=0,5\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,5.22,4=11,2\left(l\right)\)
d, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{1}{3}\left(mol\right)\Rightarrow m_{KClO_3}=\dfrac{1}{3}.122,5=\dfrac{245}{6}\left(g\right)\)
\(a.PTHH:4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(b.n_{O_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
\(\Rightarrow n_P=\dfrac{0,5}{5}.4=0,4\left(mol\right)\\ \Rightarrow m_P=0,4.31=12,4\left(g\right)\)
\(m_{O_2}=0,5.32=16\left(g\right)\\ \Rightarrow m_P+m_{O_2}=m_{P_2O_5}\\ m_{P_2O_5}=24,8+16=40,8\left(g\right)\)
a) \(PTHH:4P+5O_2\) → \(2P_2O_5\)
b) \(n_{O_2}=\dfrac{V_{O_2\left(đktc\right)}}{22,4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
Theo PTHH:
⇒ \(n_P=\dfrac{4}{5}.n_{O_2}=\dfrac{4}{5}.0,5=0,4\left(mol\right)\)
⇒ \(m_P=n.M=0,4.31=12,4\left(g\right)\)
c) Theo định luật bảo toàn khối lượng
⇒ \(m_P+m_{O_2}=m_{P_2O_5}\)
⇒ \(m_{P_2O_5}=?\)
\(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\\ n_{O_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ PTHH:4P+5O_2\underrightarrow{t^o}2P_2O_5\\ LTL:\dfrac{0,2}{4}< \dfrac{0,4}{5}\Rightarrow O_2dư\)
\(n_{O_2\left(pư\right)}=\dfrac{5}{4}n_P=\dfrac{5}{4}.0,2=0,25\left(mol\right)\\ n_{O_2\left(dư\right)}=0,4-0,25=0,15\left(mol\right)\)
\(n_{P_2O_5\left(lt\right)}=\dfrac{1}{2}n_P=\dfrac{1}{2}.0,2=0,1\left(mol\right)\\ m_{P_2O_5\left(lt\right)}=0,1.142=14,2\left(g\right)\\ m_{P_2O_5\left(tt\right)}=0,1.142.80\%=11,36\left(g\right)\)
1. \(4P+5O_2\underrightarrow{^{t^o}}2P_2O_5\)
2. Ta có: \(n_P=\dfrac{1,24}{31}=0,04\left(mol\right)\)
Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,02\left(mol\right)\Rightarrow m_{P_2O_5}=0,02.142=2,84\left(g\right)\)
3. \(n_{O_2}=\dfrac{5}{4}n_P=0,05\left(mol\right)\Rightarrow V_{O_2}=0,05.22,4=1,12\left(l\right)\)
\(n_P=\dfrac{3.1}{31}=0.1\left(mol\right)\)
\(4P+5O_2\underrightarrow{^{^{t^0}}}2P_2O_5\)
\(0.1.......0.125.....0.05\)
\(V_{O_2}=0.125\cdot22.4=2.8\left(l\right)\)
\(m_{P_2O_5}=0.05\cdot142=7.1\left(g\right)\)
nP= 3,1 / 31 =0,1 mol
2P + 5/2O2 → P2O5
0,1 0,125 0,05 mol
VO2=0,125.22,4=2,8 l
b) mP2O5=0,05.142=7,1 g
\(PTHH:4P+5O_2->2P_2O_5\)
Số mol của Photpho: \(n_P=\dfrac{m}{M}=\dfrac{6,2}{31}=0,2\left(mol\right)\)
\(PTHH:4P+5O_2->2P_2O_5\)
4 mol 5 mol 2 mol
0,2 mol --------> 0,1 mol
Khối lượng Diphotpho Pentaoxit: \(\left(M_{P_2O_5}=142g/mol\right)\)
\(m_{P_2O_5}=n.M=0,1.142=14,2\left(g\right)\)
b) \(PTHH:4P+5O_2->2P_2O_5\)
4 mol 5 mol
0,2 mol -> 0,25 mol
Thể tích khí oxi (đktc) cần dùng: \(V_{O_2}=n.22,4=0,25.22,4=5,6\left(l\right)\)
Chúc bn học tốt nha ^^
a) 4P + 5O2 --to--> 2P2O5
b) \(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)
PTHH: 4P + 5O2 --to--> 2P2O5
_____0,1-->0,125---->0,05
=> mP2O5 = 0,05.142 = 7,1 (g)
c) VO2 = 0,125.22,4 = 2,8(l)
\(n_{O_2\left(đktc\right)}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ 4P+5O_2\underrightarrow{^{to}}2P_2O_5\\ 0,12........0,15.........0,06\left(mol\right)\\ m_P=0,12.31=3,72\left(g\right)\)
Ta có: \(n_{O_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: 4P + 5O2 ---to---> 2P2O5.
Theo PT: nP = \(\dfrac{4}{5}.n_{O_2}=\dfrac{4}{5}.0,15=0,12\left(mol\right)\)
=> mP = 31 . 0,12 = 3,72(g)