Percentage composition example (Edexcel GCSE Chemistry Combined Science): Quizzes

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Percentage composition example
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What formula calculates % mass of an element in a compound?

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

In the % composition formula, what is multiplied by 100 in the numerator?

Relative atomic mass × number of atoms

What does RFM stand for in the % composition formula?

Relative Formula Mass

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

23

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

32

What is the relative atomic mass 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

To find % mass of Na in Na2SO4Na_2SO_4, what calculation is used?

46142×100\frac{46}{142} \times 100

What is the % of sodium in sodium sulphate (Na2SO4Na_2SO_4)?

32.4%

Explore Edexcel GCSE Chemistry Combined Science Revision Notes by Topics

The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

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The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

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The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

Explore Edexcel GCSE Chemistry Combined Science Exam Questions by Topics

The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

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