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. nP=3,1\31=0,1(mol)
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)