Percentage composition example (Edexcel GCSE Chemistry): Quizzes

📚Quizzes
Revision NotesModel AnswersQuizzesFlashcardsExam Questions
Percentage composition example
Sign up to keep practising.Create a free account to play more quizzes and track your progress.

Practise the questions

10 questions from this quiz

Show

What is the formula for calculating percentage composition by mass?

Ar×atoms×100RFM\frac{Ar \times atoms \times 100}{RFM}

What is the relative atomic mass (Ar) of sodium (Na)?

23

What is the relative atomic mass (Ar) of sulfur (S)?

32

What is the relative atomic mass (Ar) of oxygen (O)?

16

What is the RFM of sodium sulphate (Na2SO4Na_2SO_4)?

142

What is the total mass of sodium in Na2SO4Na_2SO_4?

46

What is the percentage by mass of sodium in Na2SO4Na_2SO_4?

32.4%

What is the first step in calculating percentage composition?

Find the relative atomic masses

In the formula for %\% mass, what goes in the denominator?

RFM

How is the RFM of Na2SO4Na_2SO_4 calculated?

(23×2)+32+(16×4)(23 \times 2) + 32 + (16 \times 4)

Explore Edexcel GCSE Chemistry Revision Notes by Topics

The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

Explore Edexcel GCSE Chemistry Model Answers by Topics

The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

Explore Edexcel GCSE Chemistry Flashcards by Topics

The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

Explore Edexcel GCSE Chemistry Exam Questions by Topics

The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

Join 100,000+ GCSE students studying Quizzes with us.

Select your subjects, and get access to A+ resources today.