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Problem: Ammonia is produced from the reaction of nitrogen and hydrogen according to the following balanced equation:N2 (g) + 3 H 2 (g) → 2 NH 3 (g)Given a mixture of 1.00 x 10 3 g N2 and 5.00 x 10 2 g H2, what mass of which starting material would remain unreacted?

🤓 Based on our data, we think this question is relevant for Professor Bussey's class at UCSD.

FREE Expert Solution

Step 1: From the problem, the given combustion reaction is:

N2 (g) + 3 H 2 (g) → 2 NH 3 (g)



Now that we have a balanced equation, we can proceed with the problem.



Step 2: Notice that we are given the mass of both reactants: this means we need to determine the limiting reactant, which is the reactant that forms the less amount of product


This is because once the limiting reactant is all used up, the reaction can no longer proceed and make more products.

This means the limiting reactant determines the maximum mass of the product formed.



We need to perform a mole-to-mole comparison between each reactant and NH3



From N2: 

molar mass N2 = 28.02 g/mol

molar mass NH3 = 17.034 g/mol


mass NH3=1.00×103 g N2×1 mol N228.02 g N2×2 mol NH31 mol N2×17.034 g NH31 mol NH3

mass NH3 = 1215.8 g NH3



From H2: 


mass NH3=5.00×102 g H2×1 mol H22.016 g H2×2 mol NH33 mol H2×17.034 g NH31 mol NH3

mass NH3 = 2816.5 g NH3


Since N2 forms fewer NH3  → 2 is the limiting reactant.


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Problem Details

Ammonia is produced from the reaction of nitrogen and hydrogen according to the following balanced equation:

N2 (g) + 3 H 2 (g) → 2 NH 3 (g)

Given a mixture of 1.00 x 10 3 g N2 and 5.00 x 10 2 g H2, what mass of which starting material would remain unreacted?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Limiting Reagent concept. If you need more Limiting Reagent practice, you can also practice Limiting Reagent practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Bussey's class at UCSD.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.