Actual Yield Calculator
Our chemical reactions calculator computes actual yield accurately. Enter measurements for results with formulas and error analysis.
Formula
Actual Yield = (Percent Yield / 100) * Theoretical Yield
Actual yield is the measured amount of product obtained from a reaction. Percent yield = (actual/theoretical) * 100 measures efficiency. Theoretical yield is the maximum possible product calculated from stoichiometry.
Frequently Asked Questions
What is actual yield in chemistry?
Actual yield is the amount of product actually obtained from a chemical reaction, measured experimentally in the laboratory. It is almost always less than the theoretical yield due to incomplete reactions, side reactions, loss during transfer and purification, and equilibrium limitations. Actual yield is expressed in mass units (grams, milligrams, or kilograms) and is a real measured quantity, unlike theoretical yield which is calculated from stoichiometry. Knowing the actual yield is essential for calculating percent yield and evaluating reaction efficiency.
Why is actual yield usually less than theoretical yield?
Several factors cause actual yield to fall below theoretical yield. Incomplete reactions may not go to completion, especially reversible reactions that reach equilibrium. Side reactions produce unwanted byproducts, consuming some reactant. Mechanical losses occur during transfer between containers, filtration, and purification steps like recrystallization or distillation. Impure reagents may contain less reactive material than assumed. Human error in measurement and technique also contributes. Even expert chemists rarely achieve 100% yield in multi-step organic syntheses.
Can percent yield exceed 100%?
A true percent yield cannot exceed 100% because you cannot produce more product than stoichiometry allows. However, measured values above 100% can occur due to experimental errors. Common causes include incomplete drying of the product (residual solvent adds mass), contamination with impurities or unreacted starting material, side products that are not separated, and measurement errors in weighing. If you calculate a yield over 100%, you should check your procedure for these issues and improve your purification technique.
How do you calculate theoretical yield?
Theoretical yield is calculated using stoichiometry from the balanced chemical equation. First, determine the moles of each reactant from their masses and molar masses. Then, identify the limiting reagent by comparing molar ratios. Use the limiting reagent moles and the stoichiometric ratio to calculate moles of product. Finally, convert moles of product to grams using the product molar mass. The theoretical yield represents the maximum possible product assuming the reaction goes to completion with no losses.
What is APY vs APR in crypto yield?
APR is the simple annual rate without compounding. APY includes the effect of compounding. A 10% APR compounded daily equals roughly 10.52% APY. Always compare APY to APY for accurate yield comparisons.
What formula does Actual Yield Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.