Chemical Reaction Stoichiometry

Hello,

This post is about relationships between different parts of a chemical reaction.  These "parts" are chemical formulas found in the chemical equation for the reaction.  The equation must be balanced.  Click here for a review.  Using the balanced equation, we compare moles of formula pairs of interest.  We get the moles from the formula coefficients and form a factor called the mole ratio.  The mole ratio is the stoichiometry step in these types of problems.  We can then use the molar masses of reactants and/or products to calculate "best" outcomes for any chemical reaction.  The following diagram, featuring the Haber Process Reaction, demonstrates the reaction quantity interpretation necessary to carry out stoichiometric calculations.

Here is an example calculation!

This calculation was set up as a "simpler case scenario" because an excess amount of nitrogen gas is specified: Hydrogen gas, then, must be the limiting reactant and controls the extent of ammonia formed.  Another important point is that the 141 g ammonia result is the maximum mass of product that can be produced from 25.0 g hydrogen gas.

That's all for this post.  My next post will focus on reaction stoichiometry when the limiting reactant is not indicated!

Thank you for reading.



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