I really need help in these questions, please help me answer it. Urea (CH4N2O) i

Question

I really need help in these questions, please help me answer it.

Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH3) with carbon dioxide as follows: 2NH3(aq)+CO2(aq)CH4N2O(aq)+H2O(l) In an industrial synthesis of urea, a chemist combines 133.0 kg of ammonia with 211.4 kg of carbon dioxide and obtains 173.0 kg of urea.   

Part A

Determine the limiting reactant.

Express your answer as a chemical formula.

Part B

Determine the theoretical yield of urea

Express your answer using four significant figures

Part C

Determine the percent yield for the reaction.

Express your answer using three significant figures.

Explanation / Answer

2NH3(aq) + CO2(aq) -----------------------> CH4N2O(aq) + H2O(l)

34 g               44 g                                      60 g               18 g

0.133 g         0.2114 g                                   ??

a) here limiting reagent is NH3.

b)

34 g NH3   --------------------> 60 g of urea

133000 g NH3 ---------------> ??

theoretical yield of urea = 133000 x 60 / 34 = 234706 g

theoretical yield of urea = 234.7 kg

c)

percent yield = (actual / theoretical ) x 100

                    = (0.1730 / 0.2347 ) x 100

                    = 73.7 %

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