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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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smnam smnam
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11 years ago
How many kg of HCN can be formed if 2.25 Kg of ammonia, methane and oxygen all react to form hydrogen cyanide and water?  What is the limiting reagent?
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rja5200rja5200
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11 years ago
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11 years ago
Balanced equation:
2 CH4 + 2 NH3 + 3 O2 ? 2 HCN + 6 H2O
2mol NH3 react with 2m,of NH3 and 3mol O2 to form 2mol HCN

First task is tp find the limiting reactant:
2.25kg CH4 = 2250/16 = 140.625mol
2.25kg NH3 = 2250/17 = 132.352 mol
2.25kg O2 = 2250/32 = 70.3125mol

Oxygen is the limiting reactant:
From the balanced equation:
3mol Of O2 react to produce 2mol HCn
Therefore 70.3125mol O2 will produce  70.3125/3*2 = 46.875mol HCN

Molar mass HCN = 1+12+14 = 27g/mol
46.875mol HCN = 27*46.875 = 1,265.6g

Mass HCN produced = 1.266kg
As above, O2 is limiting
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