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Question

If a molecule of nitrogen combines with three of hydrogen, how many molecules of ammonia will be formed?


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Solution

Balance chemical equation: The number of atoms present on the reactant side should be equal to the number of atoms present on the product side.

The number of molecules of ammonia(NH3) formed by using 1 molecule of nitrogen(N2) and 3 molecules of hydrogen(H2) can be determined by balancing the chemical equation.

Given the chemical reaction :

N2 (g)+ 3H2 (g) ⇢ NH3 (g)

Now, balance the above chemical equation.

On the reactant side, the number of atoms of N is 2, and the number of atoms of H is 6.

On the product side, the number of atoms of N is 1, and the number of atoms of H is 3.

In order to balance the chemical equation multiply the product side by 2.

Reactions become

N2 (g)+ 3H2 (g)⇢ 2 NH3(g)

Final answer: 2 molecules of is ammonia is formed.


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