How many moles of sulphur trioxide will be produced when two moles of sulphur combine with three moles of oxygen?

Sulphur reacts with oxygen to produce sulphur trioxide. It is a combination reaction.

The balanced chemical equation for the given reaction is:

$2\mathrm{S}\left(\mathrm{g}\right)+3{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{SO}}_3\left(\mathrm{g}\right)$

It can be easily observed from the reaction that two moles of sulphur combine with three moles of oxygen to produce two moles of sulphur trioxide.