2NH3 + CO2 ==> (NH2)2CO + H2O
1a. mols NH3 = grams/molar mass
1b. mols CO2 = grams/molar mass
2a. Using the coefficients in the balanced equation, convert mols NH3 to mols of urea.
2b. Do the same to convert mols CO2 to mols urea.
2c. It is likely that these two values will not agree which means one of them is not right; the correct value in limiting reagent problems is ALWAYS the smaller value and the reagent producing that value is the limiting reagent.
3. Convert mols urea to grams urea by g urea = mols urea x molar mass urea. This is the theoretical yield.
Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water.
637.2g of ammonia are reacted with 787.3 g of carbon dioxide.
a. Which of the two reactants is a limiting reactant? Show your calculations (including the correctly
balanced chemical equation) to explain your choice.
what is the Balanced Chemical Equation:
Calculations:
Explanation and conclusion:
b. Which of the two reactants should you use to calculate the theoretical yield (= the maximum amount
possible)? Explain why.
2 answers
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1 answer