Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of
ID: 561494 • Letter: U
Question
Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH3) with carbon dioxide as follows: 2 NH3 (aq) + CO2 (aq) CH4N2O (aq) + H2O (1) In an industrial synthesis of urea, a chemist combines 124.2 kg of ammonia with 211.4 kg of carbon dioxide and obtains 169.8 kg of urea.Question 1: Determine the limiting reactant
Question 2: Determine the theoretical yield of urea
Question 3: Determine the percentage yield for the reaction Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH3) with carbon dioxide as follows: 2 NH3 (aq) + CO2 (aq) CH4N2O (aq) + H2O (1) In an industrial synthesis of urea, a chemist combines 124.2 kg of ammonia with 211.4 kg of carbon dioxide and obtains 169.8 kg of urea.
Question 1: Determine the limiting reactant
Question 2: Determine the theoretical yield of urea
Question 3: Determine the percentage yield for the reaction
Question 1: Determine the limiting reactant
Question 2: Determine the theoretical yield of urea
Question 3: Determine the percentage yield for the reaction
Explanation / Answer
The balanced equation of reaction is
2NH3(aq) + CO2(aq) ------------------> CH4NO(aq) + H2O(l)
124.2x103 /17 211.4x103 /44 0 0 initial moles
Q1)
To calculate the limiting reagent
=7.30x103 = 4.8x103
the ratio is
7.30x103 /2=3.6x103 4.8x103 /1 =4.8x103
Thus NH3 has lower value thus NH3 is the limiting reagent
Q2)
The theoretical yield is obtianed using the limiting reagent.
2NH3(aq) + CO2(aq) ------------------> CH4NO(aq) + H2O(l)
124.2x103 /17 211.4x103 /44 0 0 initial moles
=7.30x103 = 4.8x103
0 4.8x103 -3.6 x103 3.6x103 - after reaction
Thus moles of urea formed = 3.6x103 moles
mass of urea formed = moles x molar mass
= 3.6x103 mol x 60g/mol
= 216 x103 g
= 216 kg
Thus the theoretical yield of urea = 216 kg
Q3)
actual yield of urea = 169.8 kg
% yield = actual yield x 100/theoretical yield
= 169.8x100/216
= 78.61%
The % yield = 78.61% of urea
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