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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: rosystarr on November 13, 2004, 05:17:54 PM

Title: molecules
Post by: rosystarr on November 13, 2004, 05:17:54 PM

nitrogen and hydrogen react to form ammonia. The unbalanced equation is

N2 + H2 > NH3

How many ammonia molecules are formed by the reaction of three nitrogen molecules?

Thank You!

Title: Re:molecules
Post by: Donaldson Tan on November 13, 2004, 07:55:03 PM

this is simple balancing. if you are not sure using integer coefficient, why not try fractions?

N₂ + H₂ -> NH₃

2N on LHS and 1 N on RHS, so coefficient of N₂ = 1/2

2H on LHS and 3H on RHS, so coefficient of H₂ = 3/2

1/2 N₂ + 3/2 H₂ -> NH₃

multiply through out by lowest common multiple of the denominators to convert the fractions to integer.

Solution: N₂ + 3H₂ -> 2NH₃ (multiply by 2 through out)

Title: Re:molecules
Post by: VanNistelrooy on December 30, 2004, 07:08:32 AM

 N2 + H2 -> NH3
This is not a balanced equation because on reactants side there are two H atoms and two N atoms whereas on product side there are 3 H atoms and 1 N atom.so it is not balanced ,the balanced equation will be :
 N2 + 3H2 > 2NH3
now on product side there are 2 N atoms and 6 H atoms ( 2*3). and on reactant side also there are 2 N atoms and 6 H atoms (3*2). So this equation is balanced.

Now to react with if you have 3 N2 molecules then the equation will be:
 3N2 + 9H2 > 6NH3
Therefore 3 nitrogen molecules will for 6 ammonia molecules.