On heating 8 moles each of Li₂CO₃ and K₂CO₃, how many moles of CO₂ evolved?

On heating only Li₂CO₃ decomposed
${\mathrm{Li}}_2{\mathrm{CO}}_3\to {\mathrm{Li}}_2\mathrm{O}+{\mathrm{CO}}_2$
8 moles of CO₂ will be evolved on heating 8 moles of Li₂CO₃
K₂CO₃ is thermally stable, does not undergo decomposition.