a)\(2KClO3-->2KCl+3O2\)
b)\(n_{KCLO3}=\frac{9,8}{122,5}=0,08\left(mol\right)\)
\(n_{O2}=\frac{3}{2}n_{KC_{ }lO3}=0,12\left(mol\right)\)
\(V_{O2}=0,12.22,4=2,688\left(l\right)\)
c)\(4P+5O2-->2P2O5\)
\(n_P=\frac{4}{5}n_{O2}=0,096\left(mol\right)\)
\(m_P=0,096.31=2,976\left(g\right)\)