One mole of lithium nitrate on strong heating liberates……. litres of gases at STP

$$\begin{gathered} 4{\mathrm{LiNO}}_3\left(\mathrm{s}\right) \stackrel{∆}{\to } 2{\mathrm{Li}}_2\mathrm{O}\left(\mathrm{s}\right)+ 4{\mathrm{NO}}_2\left(\mathrm{g}\right)+ {\mathrm{O}}_2\left(\mathrm{g}\right) \\ 4 \mathrm{moles} 4\mathrm{moles} 1\mathrm{mole} \\ 1 \mathrm{mole} 1\mathrm{mole} 0.25\mathrm{moles} \\ \mathrm{one} \mathrm{mole} \mathrm{of} \mathrm{any} \mathrm{gas} \mathrm{at} \mathrm{STP} \mathrm{occupy} 22.4\mathrm{l} \\ 1.25 \mathrm{moles} \mathrm{of} \mathrm{gases} \mathrm{at} \mathrm{STP} \mathrm{occupy} 28\mathrm{l} \end{gathered}$$