How many grams of carbon dioxide are needed to produce 125 grams of urea?

Answer 1

The chemical formula for urea is CH₄N₂O

CO₂ + 2NH₃ ==> CH₄N₂O + H₂O ... balanced equation

molar mass urea = 60.0 g/mol

125 g urea x 1 mol urea/60 g x 1 mol CO₂/mol urea x 44 g CO₂/mol = 91.7 g CO₂ needed

If you didn't know or didn't want to use the balanced equation above, you could still solve the problem by knowing that 1 mol CO2 produces 1 mol urea since there is 1 C in urea.