(NH4)2CO3 = 2NH3 + CO2 + H2O

Question

If you have 3.5 moles of Ammonia how much
carbon dioxide was also made?

Answer 1

3.5 moles NH3 x (1 mole CO2/2 moles NH3) = ??
Note how the conversion factor cancels the unit we start with to give the unit we want at the end of the work.