A student carried out the reaction below starting with 1.993 g of unknown (X₂CO3), and
found that the mass loss due to CO₂ was 0.593 g.
X₂CO3(s) + 2 HCl(aq) ® 2 XCl(aq) + H₂O() + CO₂(g)

How many moles of CO₂ were produced?