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 132.0 kg of ammonia with 211.4 kg of carbon dioxide and obtains 172.7 kg of urea. determine the limiting reactant

NH₃ is the limiting reagent

Explanation:

Mass of ammonia = 132.0kg

Mass of carbon dioxide = 211.4kg

Mass of urea = 172.7kg

Unknown:

Limiting reagent = ?

Solution

 First, we write the balanced stoichiometeric equation:

     2NH₃ + CO₂ → CH₄N₂O + H₂O

The reactant that is present in short supply determines the amount of product that is formed in a reaction. This reactant is called the limiting reagent.

    To establish the limiting reagent, we need to go find out what is happening at the start of the reaction:

Convert the masses of the reactants to moles.

Number of moles of NH₃ =

   Molar mass of NH₃ = 14 + (3x1) = 17g/mol

   Number of moles of NH₃ =   = 7.765mole

Number of moles of CO₂ =  

    Molar mass of CO₂ = 12 + (2 x 16) = 44g/mol

     Number of moles of CO₂ =   = 4.805mole

From the reaction equation:

   2 moles of NH₃ reacted with 1 mole of CO₂

so 7.765 mole of NH₃ will require mole, 3.883 of CO₂

But we are given 4.805mole of CO₂.

Therefore, CO₂ gas is in excess and NH₃ is the limiting reagent.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.