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The balanced chemical equation for the formation of ammonia gas by the reaction between nitrogen gas and hydrogen gas is given
N2+3H22NH3
How many moles of ammonia are formed when 6 moles of N2 react with 6 moles of H2?

Answer
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Hint: The limiting reagent is the one which is consumed in the reaction process when the reaction is completed. It limits the amount of product which can be formed. So we need to find the limiting reagent in this reaction and consequently the moles of ammonia needed to react with 6 moles of H2

Complete step by step solution: We have been given the balanced chemical equation for the formation of ammonia which is stated as follows
N2+3H22NH3
From the above reaction we infer that 1 mole of N2 reacts with 3 moles of H2
Therefore 6 moles of will react with 18 moles of H2
Now the given amount of H2 = 6 moles
Therefore H2 is the limiting reagent as it is compN2letely consumed in the reaction.
Now again from the given reaction we infer that
Number of moles of ammonia formed when 3 moles of H2 reacts with excess of N2=2
Number of moles of ammonia formed when 6 moles of H2 reacts with excess of N2=23×6=4 moles
Therefore 4 moles of ammonia are formed when 6 moles of N2 reacts with 6 moles of H2

Therefore the number of moles of ammonia formed is four.

Note: Limiting reagent can be found by the following procedures
-Determining the balanced chemical equation
-Convert all the given information into moles
-Calculate the mole ratio from the given data.
-Use the amount of limiting reagent to find the amount of product formed.
These are the procedures to find the limiting reagent in a chemical reaction.