\(n_{O_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\\ n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\\ 4P+5O_2\underrightarrow{^{to}}2P_2O_5\\ Vì:\dfrac{0,6}{5}>\dfrac{0,2}{1}\\ \Rightarrow O_2dư\\ n_{P_2O_5\left(LT\right)}=\dfrac{2}{4}.0,2=0,1\left(mol\right)\\ n_{P_2O_5\left(TT\right)}=0,1.75\%=0,075\left(mol\right)\\ m_{P_2O_5\left(TT\right)}=142.0,075=10,65\left(g\right)\)
\(n_P=\dfrac{6,2}{31}=0,2\left(mol\right);n_{O_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
PTHH: 4P + 5O2 ---to→ 2P2O5
Mol: 0,2 0,1
Ta có:\(\dfrac{0,2}{4}< \dfrac{0,6}{5}\) ⇒ P hết, O2 dư
\(m_{P_2O_5\left(lt\right)}=0,1.142=14,2\left(g\right)\Rightarrow m_{P_2O_5\left(tt\right)}=\dfrac{14,2}{75}.100=18,94\left(g\right)\)
