Free printable worksheet

Stoichiometry Worksheet

Twelve quantitative stoichiometry problems using chemical relationships, calculations, and data analysis.

ChemistryGrades 9-124 pagesAnswer key included

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What this worksheet includes

  • Twelve quantitative stoichiometry problems using chemical relationships, calculations, and data analysis.
  • 4-page printable PDF with a complete answer key
  • Designed for Grades 9-12 chemistry practice
  • First-page preview available before the free email unlock

How to use it

Use this stoichiometry worksheet for guided practice, independent review, homework, tutoring sessions, or a quick skills check. The spacious layout is designed to leave room for students to show their work rather than guess from crowded answer choices.

After students finish, compare their reasoning with the included answer key. When an answer is incorrect, have the student locate the first step where their work changed direction before trying the problem again.

Who this practice is for

This resource is designed for grades 9-12 students working on chemistry. Teachers, tutors, homeschool families, and parents can preview the first page before deciding whether the level and spacing fit the student.

Looking for a broader sequence? Browse all Chemistry worksheets.

Topic guide

How to approach stoichiometry

Stoichiometry becomes easier when students translate the given data into a measurable relationship before calculating. Twelve quantitative stoichiometry problems using chemical relationships, calculations, and data analysis.

This chemistry worksheet progresses from direct quantitative relationships to multi-step chemical applications. Students balance units, formulas, particles, and coefficients while checking whether each result is chemically reasonable.

Learning objectives

  • Apply quantitative relationships used in stoichiometry
  • Track units, chemical formulas, coefficients, and significant figures
  • Check calculated results using conservation and chemical meaning

Skills to review first

  • Core scientific relationships connected to stoichiometry
  • Fractions, percentages, ratios, and one-variable calculations
  • Reading units, tables, formulas, and scientific notation
Worked example

Follow the reasoning step by step

Solve one representative quantitative stoichiometry problem from Part A.

  1. List the given data and identify the requested quantity.
  2. Choose the relationship, ratio, probability rule, or conversion that connects them.
  3. Substitute carefully and carry units or labeled counts through the calculation.
  4. Check the scale of the result and explain what it means scientifically.

Solution: A complete solution includes the setup, calculation, labeled result, and a brief scientific interpretation when appropriate.

Try before downloading

Three sample problems

Work each problem, then open the answer to check your result.

Problem 1 · foundations

For 2H2+O2→2H2O2\mathrm{H_2}+\mathrm{O_2}\rightarrow2\mathrm{H_2O}, find mol water from 4.04.0 mol H2\mathrm{H_2}.

Show answer

4.0 mol H2O4.0\ \mathrm{mol\ H_2O}

Problem 2 · skill practice

For 2Na+Cl2→2NaCl2\mathrm{Na}+\mathrm{Cl_2}\rightarrow2\mathrm{NaCl}, find grams NaCl from 1.501.50 mol Na. Use 58.44 g/mol58.44\ \mathrm{g/mol}.

Show answer

87.7 g87.7\ \mathrm{g}

Problem 3 · mixed review

For CH4+2O2→CO2+2H2O\mathrm{CH_4}+2\mathrm{O_2}\rightarrow CO_2+2\mathrm{H_2O}, find mol oxygen needed for 3.53.5 mol methane.

Show answer

7.0 mol O27.0\ \mathrm{mol\ O_2}

Error check

Common mistakes to watch for

  • Using an unbalanced equation or an incorrect chemical formula
  • Mixing units or applying a mole ratio before converting to moles
  • Reporting a calculator result without units, precision, or a chemical reasonableness check
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