Mole Conversion Practice Problems for Chemistry

About this resource

What's inside this resource

Six molecular-mass calculations (KOH, H2SO4, H2O, Mn2Se7, MgF2, and (NH4)3PO4) lead into sixteen mole-conversion word problems that ask students to convert between grams, moles, and atoms or particles using Avogadro's number and molar mass, covering substances such as helium, oxygen, argon, magnesium, lithium fluoride, and calcium phosphate. A worked answer key follows every problem, showing the specific arithmetic (for example, 15.8 mol x 24 g/mol = 379.2 g) so a teacher can check student work step by step. The worksheet is formatted as a two-part practice set — molecular mass first, then conversion problems — intended for independent or homework practice after mole-concept instruction. Students who need more practice with the factor-label method itself, apart from chemistry units, can work through dimensional analysis practice problems covering time, distance, volume, and money conversions.

In the classroom

Teaching tips & learning objectives

Learning objectives

Student can calculate the molar mass of a compound from its chemical formula.
Student can convert between grams and moles using molar mass as a conversion factor.
Student can convert between moles and number of particles using Avogadro's number.

Teaching tips

Have students complete the six molar-mass calculations first, since those values are then reused as the conversion factor in the mole-to-gram problems that follow.
Model the two standard conversion-factor setups (1 mole = molar mass; 1 mole = 6.02x10^23 particles) shown at the top of the sheet before assigning the problems independently.
Use the worked answer key to spot-check whether students are showing dimensional-analysis setups, not just final numeric answers.

Skills covered

Molecular mass calculation — students sum atomic masses to find the molar mass of six compounds (e.g., KOH, H2SO4, Mn2Se7).
Mole-to-particle conversion — students use Avogadro's number (6.02x10^23) to convert between moles and atoms or molecules.
Mole-to-mass conversion — students convert between grams and moles using molar mass for substances such as magnesium, iron, and calcium phosphate.

Good to know

Questions teachers ask about this resource

Why does the worksheet start with molecular-mass calculations before the conversion problems?

Molar mass is one of the two conversion factors used throughout the mole problems, so working it out for six compounds first gives students the values they need before applying dimensional analysis to the grams-moles-particles conversion problems that follow.

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Resource details

Concepts & topics

Core concepts

mole concept
molar mass
Avogadro's number
stoichiometry

Topics

chemistry mole conversion practice chemistry practice practice conversion worksheet problem solving

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Categories this resource belongs to

Chemistry Worksheets Science Worksheets High School Worksheets 10th Grade Worksheets 9th Grade Worksheets Middle School Worksheets

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