Ta có:
\(n_{KClO3}=\frac{24,5}{122,5}=0,2\left(mol\right)\)
\(PTHH:2KClO_3\rightarrow2KCl+3O_2\)
_________0,2_____0,2__________0,3
\(\Rightarrow a=0,2.74,5=14,9\left(g\right)\)
\(\Rightarrow V=0,3.22,4=6,72\left(l\right)\)
\(n_P=\frac{6,2}{31}=0,2\left(mol\right)\)
\(PTHH:4P+5O_2\rightarrow2P_2O_5\)
________0,2____0,25_____0,1
Nên O2 dư
\(\Rightarrow m_{P2O5}=0,1.142=14,2\left(g\right)\)