How can I balance this equation? ____ N2 + ____ H2 ---> ____ NH3

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Oct 29, 2015

Answer:

#N_2# + 3#H_2# -----> 2N#H_3#

Explanation:

#N_2# + #H_2# -----> N#H_3#

Let us balance this equation by counting the number of atoms on both sides of the arrow.

#N_2# + #H_2# -----> N#H_3#

N=2 , H=2 N=1, H=3

To balance the number of N atom on Right Hand Side (RHS) , I will add one molecule of N#H_3# on RHS

#N_2# + #H_2# -----> 2N#H_3#

N=2 , H=2 N=2 , H= 6

To balance the number of H atoms on Left Hand Side (LHS) , I will add two molecules of #H_2# on LHS

#N_2# + 3#H_2# -----> 2N#H_3#

N=2 , H=6 N=2 , H= 6

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35
Mar 1, 2018

This reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.

#N + H -> NH_3#

We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to

#N_2 + H_2 -> NH_3#

Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

#N_2 + 3H_2 -> 2NH_3#

This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

I hope this was helpful.
SMARTERTEACHER


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