Thanks for your help

Question

Ammonia can be reacted with carbon dioxide to form urea, as shown below. If 170 g ammonia were consumed in a reaction with excess carbon dioxide, what mass of urea could be produce? 

The molar mass of ammonia is 17g/mole and that of urea is 60g/mole.

    2NH3 + CO2 —> CO(NH2)2 + H2O

Answer 1

Hello Divine

 

We have to use stoichiometry to convert mass of ammonia to mass of urea.  The process is:

 

g NH3 →mol NH3 →mol urea → g urea

 

From the balanced reaction, you can see that 2 moles of NH3 reacts to form 1 mole of urea.

 

170 g NH₃ x (1 mol NH₃ / 17 g NH₃) x (1 mol urea / 2 mol NH₃) x (60 g urea / 1 mol urea)

 

=  300 g urea