Mole concept quiz for AP Chemistry: 10 questions with answers

by aicko
28 October 202628 October 2026

Quick answer: A mole is 6.022 × 10²³ particles, and its mass in grams is the molar mass M, so n = m/M links mass to amount. This AP Chemistry quiz checks mole concept with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Mole concept quiz for AP Chemistry: 10 questions with answers

This mole concept quiz for AP Chemistry has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on mole concept.

Choose the best answer to each of the 10 questions on moles, isotopes, formulas and mixtures. Read each explanation, because the wrong options match real student errors.

Level: AP Chemistry · Curriculum: AP Chem Unit 1

Contents

Mole concept quiz: the questions

How many moles are in 49.0 g of sulfuric acid, H₂SO₄ (M = 98.0 g/mol)?

How many atoms are in 0.20 mol of copper?

A mass spectrum has peaks at 20 (90 %) and 22 (10 %). The average mass is

Why does the average atomic mass of chlorine equal 35.45?

An oxide contains 0.40 mol of metal and 0.60 mol of oxygen. The empirical formula is

The empirical formula of C₆H₁₂O₆ is

The percent by mass of oxygen in water, H₂O, is closest to

To convert moles to grams you

Which is a mixture?

A hydrate loses 36 % of its mass as water on heating. The remaining 64 % is the

Define one mole. — 6.022 × 10²³ particles

Avogadro constant value? — 6.022 × 10²³ per mol

Moles from mass? — n = m/M

Number of particles from moles? — N = n × 6.022 × 10²³

Average atomic mass formula? — Sum of (fraction × isotope mass)

What does a mass spectrum peak height show? — Relative abundance of an isotope

Empirical formula means? — Simplest whole-number atom ratio

Molecular from empirical formula? — Multiply by M / empirical mass

Mass percent of a part? — (part / whole) × 100

What is a hydrate? — A salt with water in its crystals

Follow us