a, Ta có: \(n_{KClO_3}=\dfrac{24,5}{122,5}=0,2\left(mol\right)\)
PT: \(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)
____0,2_________________0,3 (mol)
\(\Rightarrow V_{O_2}=0,3.22,4=6,72\left(l\right)\)
b, PT: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
_____0,24__0,3 (mol)
\(\Rightarrow m_P=0,24.31=7,44\left(g\right)\)
Bạn tham khảo nhé!