Mole Conversions and Percent Composition

Presentation

•

Chemistry

•

9th - 11th Grade

•

Hard

Joseph Anderson

FREE Resource

6 Slides • 10 Questions

Moles and Percent Composition

The Mole

1 mole= 6.02 x 10²³ particles of ANY element, compound, etc.
1 mole= the molar mass of any element

Multiple Choice

How many grams are in 1.2 x 10²⁴ atoms of C?

29.34 grams

23.94 grams

6.02 grams

1.21 grams

Multiple Choice

How many moles are in 3.01 x 10²² atoms of magnesium?

0.05 moles

1.81 x 10⁴⁶ moles

5.00 x 10²¹ moles

5.00 moles

Multiple Choice

How many moles are in 19.82 g Mg?

1.23 mol Mg

481.70 mol Mg

1.00 mol Mg

0.82 mol Mg

Multiple Choice

How many molecules are in 2.5 mol of NaCl?

1.50 x10²⁴molecules

1.50 molecules

4.15 molecules

1.51 x10²⁴molecules

Percent Composition

The percent of a specific element in a chemical formula

Multiple Choice

Calculate the number of atoms in 0.0340 g Zn.

5.200 x 10^-4 atoms Zn

3.130 x 10²³ atoms Zn

3.130 x 10²⁰ atoms Zn

1 atom Zn

Percent Composition

The percent of a specific element in a chemical formula

How to find percent composition

Step 1: Find the total molar mass of the compound
Step 2: Place the entire mass of the specific element you want to find in the numerator and the total molar mass you found in step one in the denominator
Divide the numbers and multiply by 100

Multiple Choice

What is the percent composition by mass of sulfur (S) in the compound MgSO₄?

20.22%

19.85%

26.64%

28.64%

Multiple Choice

Find the percent composition of Cu₂S?

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

Multiple Choice

What is the percent composition by mass of oxygen in the compound MgSO₄ (gram formula mass = 120 g/mol)?

20%

27%

46%

53%

Multiple Choice

What is the percent by mass of fluorine in CaF₂(gram-formula mass = 78 g/mol)?

24%

49%

51%

65%

Multiple Choice

What is the percent by mass of oxygen in MgO?

20%

40%

50%

60%

Moles and Percent Composition

Show answer

Auto Play

Slide 1 / 16

SLIDE

Similar Resources on Wayground

10 questions

PERIODIC TABLE BASICS

Presentation

•

9th - 12th Grade

10 questions

Introduction to the Periodic Table

Presentation

•

10th - 12th Grade

11 questions

2nde 2019 ch 01c composition volumiq air Leçon

Presentation

•

9th - 12th Grade

13 questions

Molarity

Presentation

•

10th - 12th Grade

12 questions

Parts of an Atom Review

Presentation

•

10th - 11th Grade

9 questions

Ch. 11.2 - Types of Chemical Reactions PART 1

Presentation

•

9th - 11th Grade

10 questions

YR 9 -Chemistry revision - Chemical formulae

Presentation

•

9th - 11th Grade

12 questions

Gram Formula Mass

Presentation

•

10th - 12th Grade

Popular Resources on Wayground

10 questions

Safety Day 2026 – Student Review

Quiz

•

9th Grade

21 questions

Continents and Oceans

Quiz

•

6th Grade

20 questions

Parts of Speech

Quiz

•

5th Grade

16 questions

Subject & Predicate

Quiz

•

5th Grade

25 questions

Multiplication Facts

Quiz

•

5th Grade

12 questions

Map Skills

Quiz

•

3rd Grade

22 questions

Continents and Oceans

Quiz

•

5th Grade

15 questions

Rounding Decimals

Quiz

•

5th Grade

Discover more resources for Chemistry

20 questions

electron configurations and orbital notation

Quiz

•

9th - 12th Grade

20 questions

Periodic Table Trends

Quiz

•

11th Grade

25 questions

Writing and Naming Binary Ionic compounds

Quiz

•

10th Grade

20 questions

COUNTING ATOMS

Quiz

•

10th Grade

50 questions

Unit 3: Atomic Assault Summative Review

Quiz

•

11th Grade

20 questions

Physical or Chemical Change/Phases

Quiz

•

8th Grade - University

15 questions

Periodicity Module Exam Practice Quiz

Quiz

•

9th - 12th Grade

20 questions

Naming Ionic Compounds

Quiz

•

10th Grade