\(n_P=\dfrac{23,87}{31}=0,77\left(mol\right)\\ 4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\\ n_{O_2}=\dfrac{5}{4}.0,77=0,9625\left(mol\right)\\ V_{O_2\left(đktc\right)}=0,9625.22,4=21,56\left(l\right)\\ V_{kk\left(đktc\right)}=21,56.5=107,8\left(lít\right)\)
Ta có: \(n_P=\dfrac{23,87}{31}=0,77\left(mol\right)\)
PT: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
Theo PT: \(n_{O_2}=\dfrac{5}{4}n_P=0,9625\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,9625.22,4=21,56\left(l\right)\)
\(\Rightarrow V_{kk}=\dfrac{V_{O_2}}{20\%}=107,8\left(l\right)\)