Organic Synthesis Calculator

Synthesis Calculation Form

Reaction name

Reactant A

Reactant B

Product name

Reactant A mass (g)

Reactant A molar mass (g/mol)

Reactant A coefficient

Reactant B mass (g)

Reactant B molar mass (g/mol)

Reactant B coefficient

Product coefficient

Product molar mass (g/mol)

Actual product mass (g)

Product purity (%)

Reaction conversion (%)

Product selectivity (%)

Solvent and workup mass (g)

Other waste mass (g)

Target product mass (g)

Example Data Table

Item	Example Value	Meaning
Reactant A	Salicylic acid, 2.00 g, 138.12 g/mol	Primary limiting reagent candidate
Reactant B	Acetic anhydride, 3.00 g, 102.09 g/mol	Second reagent or excess reagent candidate
Product	Acetylsalicylic acid, 180.16 g/mol	Desired isolated product
Actual mass	2.20 g at 98% purity	Used for corrected percent yield

Formula Used

Moles: moles = mass ÷ molar mass.

Limiting extent: extent = moles ÷ stoichiometric coefficient.

Theoretical product moles: limiting extent × product coefficient.

Theoretical yield: theoretical product moles × product molar mass.

Pure actual mass: actual product mass × purity ÷ 100.

Percent yield: pure actual mass ÷ theoretical yield × 100.

Atom economy: product formula mass ÷ total reactant formula mass × 100.

E-factor: total material waste ÷ pure actual product mass.

PMI: total material input ÷ pure actual product mass.

How to Use This Calculator

Enter the reaction name, reactants, product, and balanced coefficients.
Add masses and molar masses for both reactants.
Enter the product coefficient and product molar mass.
Add actual product mass and purity after isolation.
Enter conversion, selectivity, solvent mass, workup mass, and waste estimates.
Press Calculate to review results below the header.
Use CSV or PDF buttons to save the calculated report.

Why Organic Synthesis Planning Matters

Organic synthesis turns a target molecule into a planned reaction. A calculator helps connect the written scheme with measurable laboratory numbers. It reduces guesswork before reagents are weighed. It also makes yield targets easier to explain. Students, researchers, and technicians can compare different routes with the same input style.

Good planning begins with stoichiometry. A balanced equation shows how many moles of each substance react. The limiting reagent controls the maximum product amount. Theoretical yield then follows from the mole ratio and product molar mass. Actual yield shows what was isolated after workup, purification, and drying.

What This Tool Reviews

This calculator combines several common synthesis checks. It estimates moles, equivalents, limiting reagent use, theoretical yield, percent yield, atom economy, conversion adjusted yield, and E-factor. These values describe both reaction success and material efficiency. They are useful during route screening, teaching, notebook review, and report writing.

Atom economy focuses on how much reactant mass becomes the desired product. A higher value suggests a cleaner transformation. E-factor looks at waste compared with product mass. A lower value means less waste for each gram of product. Together, these measures support greener reaction choices.

Interpreting the Results

Percent yield should be judged with context. A low value may result from incomplete conversion, side products, volatile losses, wet crystals, or transfer losses. A very high value may indicate solvent, salt, or impurity in the product. The result card therefore shows warnings when entries seem unusual.

Equivalents help compare reagent loading. The limiting reagent is set as one equivalent. Other substances are scaled against it. This makes procedures easier to reproduce and compare. It is also helpful when converting a published reaction into a new scale.

Practical Notes

Use accurate molar masses and balanced coefficients. Weigh materials carefully. Record actual isolated mass after drying. Include solvent and auxiliary waste when estimating E-factor. The calculator is not a safety review, purity test, or mechanism predictor. It is a planning aid for transparent calculations. Always verify compatibility, hazards, temperature control, and disposal rules before any practical work begins.

Use the exported tables to document assumptions, compare batches, and support clear discussions with supervisors, classmates, or team members after each reaction review session.

FAQs

What is an organic synthesis calculator?

It is a planning tool that converts reaction masses, molar masses, and balanced coefficients into useful synthesis values. It can estimate limiting reagent, theoretical yield, percent yield, equivalents, atom economy, and waste metrics.

Does this replace a balanced reaction equation?

No. You must enter correct stoichiometric coefficients from a balanced equation. The calculator depends on those values to find the limiting reagent and theoretical product amount.

Why is product purity included?

Purity corrects the isolated mass. A wet or impure product can make yield look too high. Using pure actual mass gives a more realistic percent yield.

What does atom economy show?

Atom economy estimates how much reactant formula mass appears in the desired product. Higher values suggest fewer atoms are lost to byproducts or leaving groups.

What does E-factor mean?

E-factor compares waste mass with product mass. Lower values usually indicate a less wasteful process. Include solvents and workup materials for a broader estimate.

Why can percent yield exceed 100%?

It can happen when the product contains solvent, water, salts, or impurities. It may also happen if masses, coefficients, molar masses, or tare values are entered incorrectly.

How are equivalents calculated?

Each reactant extent is divided by the limiting extent. The limiting reagent becomes one equivalent. Excess substances show values above one equivalent.

Can I use this for any reaction?

You can use it for many two-reactant planning cases. More complex mechanisms, catalysts, multi-step sequences, gases, hydrates, and purity corrections may need separate expert review.