\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1\left(mol\right)\)
PTHH: 2KClO3 -to, MnO2-> 2KCl + 3O2
0,1--------------------->0,1--->0,15
=> \(\left\{{}\begin{matrix}V_{O_2}=0,15.24,79=3,7185\left(l\right)\\m_{KCl}=0,1.74,5=7,45\left(g\right)\end{matrix}\right.\)
\(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)
PTHH: 4P + 5O2 --to--> 2P2O5
LTL: \(\dfrac{0,1}{4}< \dfrac{0,15}{5}\) => P có cháy hết