Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6

11.32 Percent Composition Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.32 Percent Composition. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Percent Composition: Determine percent composition by mass from formulas or experimental data and connect composition to compound identity.. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6 - Percent Composition Chemistry Standards Crosswalk: National: NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6. State frameworks: TX TEKS 112.43(c)(7)-(9); FL SC.912.P.8.7, P.8.9; MA HS-PS1-9(MA); GA Chemistry formula/stoichiometry standards; VA Chemistry nomenclature/mole standards.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Chemistry

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 11.32 Percent Composition skill assessments:

Problem 1Difficulty: Mastery

Which claim correctly connects percent composition and molecular formula?

AAny two compounds containing the same elements must have the same percent composition.

BA compound's percent composition changes whenever its sample mass changes.

CPercent composition can be found from atom counts alone without atomic masses.

DDifferent molecular formulas can have the same percent composition if their element ratios are the same.

Solution & Explanation:Percent composition depends on mass ratios. Formulas such as CH2O and C6H12O6 share element ratios and therefore mass percentages, but compounds with different ratios do not.

Problem 2Difficulty: Mastery

A compound sample contains 0.300 g carbon, 0.050 g hydrogen, and 0.400 g oxygen. What is the percent by mass of carbon in the whole sample?

A20.0%

B60.0%

C40.0%

D66.7%

Solution & Explanation:Percent by mass is (mass of carbon / total sample mass) x 100. (0.3 g / 0.75 g) x 100 = 40.0%.

Problem 3Difficulty: Mastery

Aspirin has formula C9H8O4. Use C=12.01, H=1.01, and O=16.00. What percent by mass is oxygen?

A8.9%

B35.5%

C19.0%

D55.1%

Solution & Explanation:O contributes 64.00 g/mol to one mole of C9H8O4, and the molar mass is 180.17 g/mol. (64.00 / 180.17) x 100 = 35.5%, so 35.5% is the correct percent by mass.

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Frequently Asked Questions

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Chemistry Science students. It aligns with educational standard NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6 (National: NGSS HS-PS1-1, HS-PS1-7; AP Chem Units 1 and 4; Pre-AP Unit 3; CCSS HSN-Q.A.1-3 and MP6. State frameworks: TX TEKS 112.43(c)(7)-(9); FL SC.912.P.8.7, P.8.9; MA HS-PS1-9(MA); GA Chemistry formula/stoichiometry standards; VA Chemistry nomenclature/mole standards.).