Answer: 11 moles
Step-by-step explanation:

As can be seen from the balanced chemical reaction,
1 mole of CsF reacts with 1 mole of

Thus 11 moles of CsF react with 11 mole of

Thus CsF is the limiting reagent as it limits the formation of products and
is the excess reagent as (11.5-11)=0.5 moles are in excess.
As 1 mole of CsF produces= 1 mole of

11 moles of CsF will produce=
of
