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To balance a chemical equation , we have to equalize the number of the elements present on the two sides of the arrows.
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there is only one arrow provided it is not a reversible reaction
Do a check to be sure: You have 2 nitrogen atoms on the left and 2 nitrogen atoms on the right. You have 6 hydrogen atoms on the left and 6 hydrogen atoms on the right. The equation is balanced. You can read the equation this way: 1 nitrogen molecule reacts with 3 hydrogen molecules to yield 2 ammonia molecules.
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