Stoichiometry calculations bring chemical equations and measurable quantities together in this Grade 12 Science worksheet on matter and energy. Students practise moving from a balanced reaction to the quantities of reactants and products, while working with the mole, molar mass, limiting reagents, and chemical yields. The resource also extends stoichiometric reasoning to gases and solutions, giving students practice with calculations across several common chemistry contexts.

From particles and mass to reaction quantities

The reading passage introduces the mole as a connection between particle number and amount of substance, including Avogadro’s constant, 6.022 × 10²³. Students review how molar mass converts a measured mass into moles and how coefficients in a balanced chemical equation provide the mole ratios needed for reaction calculations. These relationships are applied to mass-to-mass and particle calculations.

Further concepts include empirical and molecular formulas, limiting reagents, theoretical yield, and percent yield. Students also encounter the ideal gas law, which relates pressure, volume, temperature, and moles, alongside solution concentration calculations. Together, these topics show how stoichiometry can be used to predict reaction quantities under different conditions.

Calculation practice and chemistry reasoning

Multiple-choice questions ask students to interpret balanced equations, apply the ideal gas law, convert a carbon dioxide sample from grams to moles, and calculate ammonia production from nitrogen. Other problems involve determining an empirical formula from percentage composition, identifying a limiting reagent, calculating percent yield, finding gas volume, working out oxygen mass percent in water, and calculating molar concentration.

True-or-false statements check important distinctions, including the role of molar mass, the function of a limiting reagent, and the difference between empirical and molecular formulas. Short-answer prompts ask students to explain mass-to-mole conversion, describe how a limiting reagent affects theoretical yield, and distinguish the information represented by the two types of formula. The worksheet also includes a labeled diagram, a categorizing activity, and a short note.

What is included

• Printable Grade 12 Science stoichiometry worksheet
• Separate PDF answer key
• Student Notes lines at the bottom of the worksheet
• Teacher Guide within the Answer Key PDF, including Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes

Useful for chemistry lessons and review

Use this chemical stoichiometry practice as guided work after introducing mole calculations, independent practice with balanced equations, or review of reaction quantities and yields. The range of calculation contexts gives teachers a way to see whether students can select and apply the appropriate relationship, rather than simply recall a definition. The separate answer key supports checking, while the teacher guide provides prompts and guidance for addressing common errors.

Identified with TEKS standard SCI.12.6, this Grade 12 resource brings together mole conversions, reaction stoichiometry, formula calculations, gas-law applications, and solution concentration in one printable chemistry worksheet.