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

11.33 Empirical and Molecular Formulas Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.33 Empirical and Molecular Formulas. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Empirical and Molecular Formulas: Determine empirical and molecular formulas from percent composition, mass data, combustion data, or molar mass information. 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 - Empirical and Molecular Formulas 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 11.33 Empirical and Molecular Formulas skill assessments:

Problem 1Difficulty: Mastery

A small organic acid analysis contains only these element masses: 0.6485 g C, 0.1089 g H, 0.5760 g O. The molar mass is 74.08 g/mol. Using atomic masses C = 12.01 g/mol, H = 1.008 g/mol, O = 16.00 g/mol, what is the molecular formula?

AC6H12O4

BC2H6O2

CC3H7O2

DC3H6O2

Solution & Explanation:The mass data simplify to empirical formula C3H6O2. Since 74.08 ÷ 74.08 ≈ 1, the empirical formula is scaled to C3H6O2.

Problem 2Difficulty: Mastery

An aromatic oxygenated vapor is 79.97% C, 6.71% H, 13.32% O by mass and has a molar mass of 120.1 g/mol. Using atomic masses C = 12.01 g/mol, H = 1.008 g/mol, O = 16.00 g/mol, what is the molecular formula?

AC16H16O2

BC7H8O

CC8H8O

DC8H9O

Solution & Explanation:The percent data reduce to empirical formula C8H8O. Its empirical formula mass is 120.1 g/mol; 120.1 ÷ 120.1 ≈ 1, so the molecular formula is C8H8O.

Problem 3Difficulty: Mastery

Complete combustion data set Q: Combustion of a 0.3904 g sample containing only C, H, and O forms 1.030 g CO2 and 0.2343 g H2O. The compound's molar mass is 150.2 g/mol. What is the molecular formula?

AC18H20O4

BC9H10O2

CC8H10O2

DC9H11O2

Solution & Explanation:The combustion products give empirical formula C9H10O2. Comparing molar mass to empirical formula mass (150.2 ÷ 150.2 ≈ 1) scales the empirical formula to C9H10O2.

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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.).