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How to compute limiting reagent in Python using UliEngineering

You can easily compute the limiting reagent in a chemical reaction using the UliEngineering Python library:

limiting_reagent.py
from UliEngineering.Chemistry.Stoichiometry import limiting_reagent

# Compute limiting reagent for 2H2 + O2 -> 2H2O
# With 2 moles H2 and 1 mole O2
limiting = limiting_reagent({"H2": 2.0, "O2": 1.0}, {"H2": 2, "O2": 1})
print(f"Limiting reagent (2H2, 1O2): {limiting}")

# Compute limiting reagent with excess H2
limiting = limiting_reagent({"H2": 5.0, "O2": 1.0}, {"H2": 2, "O2": 1})
print(f"Limiting reagent (5H2, 1O2): {limiting}")

# Compute limiting reagent with excess O2
limiting = limiting_reagent({"H2": 1.0, "O2": 2.0}, {"H2": 2, "O2": 1})
print(f"Limiting reagent (1H2, 2O2): {limiting}")

Example output

limiting_reagent_output.txt
Limiting reagent (2H2, 1O2): None
Limiting reagent (5H2, 1O2): O2
Limiting reagent (1H2, 2O2): H2

The limiting reagent calculation determines which reactant will be completely consumed first in a chemical reaction, thereby limiting the amount of product that can be formed. This is fundamental to stoichiometry, reaction planning, and optimizing chemical processes. Identifying the limiting reagent allows chemists to predict maximum product yields and avoid wasting excess reactants.

The limiting reagent is determined by calculating the mole ratio of each reactant available to its stoichiometric coefficient: $\text{ratio} = \frac{n_{available}}{n_{stoichiometric}}$. The reactant with the smallest ratio is the limiting reagent. If all ratios are equal, there is no limiting reagent (reactants are in perfect stoichiometric proportion).

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