Calculator Input
Formula used
Atom balance: total atoms on reactant side = total atoms on product side for each element.
Coefficient ratio: moles of target = moles of basis × target coefficient ÷ basis coefficient.
Available mass: known mass × purity ÷ 100.
Theoretical mass: target moles × molar mass × conversion ÷ 100.
Percent yield: actual mass ÷ theoretical mass × 100.
How to use this calculator
- Enter an unbalanced equation, such as
Fe + O2 -> Fe2O3. - Enter the basis compound with a known mass.
- Enter the target product for yield calculation.
- Add actual mass when percent yield is required.
- Press calculate and review the atom audit table.
- Use CSV or PDF buttons to save the results.
Example data table
| Equation | Basis mass | Target | Balanced equation | Use case |
|---|---|---|---|---|
| Fe + O2 -> Fe2O3 | 10 g Fe | Fe2O3 | 4 Fe + 3 O2 → 2 Fe2O3 | Rust product yield |
| H2 + O2 -> H2O | 4 g H2 | H2O | 2 H2 + O2 → 2 H2O | Water formation |
| C3H8 + O2 -> CO2 + H2O | 44.1 g C3H8 | CO2 | C3H8 + 5 O2 → 3 CO2 + 4 H2O | Combustion practice |
| Ca(OH)2 + HCl -> CaCl2 + H2O | 7.4 g Ca(OH)2 | CaCl2 | Ca(OH)2 + 2 HCl → CaCl2 + 2 H2O | Neutralization |
Chemical equation yield arrow guide
Why the yield arrow matters
A yield arrow shows how reactants form products. It is simple, but it carries a lot of meaning. This calculator reads each side of the arrow and checks the atoms. It then finds the smallest whole number coefficients that make both sides equal.
Balancing and conservation
Balancing matters because atoms are conserved. A reaction cannot create carbon, oxygen, sodium, or any other element from nothing. When the same element count appears on both sides, the written reaction follows the conservation rule. That gives a cleaner base for stoichiometry, product yield, and classroom work.
Yield and mass output
The tool also connects the balanced equation with mass calculations. You can enter a known compound, a mass, purity, conversion, and actual product mass. The page uses the coefficient ratio to estimate theoretical product. It then compares actual yield with that value. This helps explain why a real laboratory result may be lower than the perfect calculation.
Arrow direction
The yield arrow can also show direction. A normal arrow suggests products are formed from reactants. An equilibrium arrow shows that both directions matter. The calculator reports the detected arrow, so the result is easier to read. It still balances atoms for the displayed sides.
Formula entry tips
Use formulas carefully. Write compounds like H2O, Ca(OH)2, Al2(SO4)3, or C6H12O6. Put reactants on the left and products on the right. Separate compounds with plus signs. Use an arrow such as -> or →. Avoid long reaction notes inside the formula box.
Learning value
This page is useful for math based chemistry practice. It turns a symbolic equation into counts, ratios, masses, and a visual chart. The CSV file helps save table data. The PDF button makes a quick printable report. Students can compare examples, review formulas, and repeat calculations with new values.
Best workflow
For best results, start with the plain unbalanced equation. Then choose the basis compound that has a known mass. Select the target product when you want yield data. If the actual mass is known, add it. The calculator will display the balanced equation, atom audit, theoretical yield, and percent yield in one place. It also supports quick checking for homework, worksheet preparation, tutoring, and early lab planning, without changing the original learning process too much.
FAQs
1. What is a yield arrow?
A yield arrow separates reactants and products. It means the substances on the left form the substances on the right during the reaction.
2. Can this calculator balance equations?
Yes. It builds an atom matrix, finds coefficient ratios, and returns the smallest practical whole number coefficients for common classroom equations.
3. Does it support parentheses?
Yes. It supports formulas such as Ca(OH)2 and Al2(SO4)3. It also reads simple hydrate dots in many common entries.
4. What is theoretical yield?
Theoretical yield is the maximum target product mass predicted by the balanced equation, basis mass, purity, and conversion setting.
5. What is percent yield?
Percent yield compares actual product mass with theoretical product mass. It equals actual mass divided by theoretical mass, multiplied by 100.
6. Why did the basis compound change?
If the entered basis is not found, the calculator uses the first reactant. Check spelling, capitalization, and subscripts in the equation.
7. Can I export the calculation?
Yes. Use the CSV button for spreadsheet data. Use the PDF button for a compact printable summary of the result.
8. Is this suitable for lab reports?
It is useful for planning and checking. For formal reports, verify constants, units, purity, side reactions, and significant figures separately.