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

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Percentage composition example
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Formula for % composition

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

Relative atomic mass (Ar) of sodium (Na)

23

Relative atomic mass (Ar) of sulfur (S)

32

Relative atomic mass (Ar) of oxygen (O)

16

RFM of Na2SO4Na_2SO_4

142

RFM calculation for Na2SO4Na_2SO_4

(23×2)+32+(16×4)=142(23 \times 2) + 32 + (16 \times 4) = 142

Mass of sodium in Na2SO4Na_2SO_4

23×2=4623 \times 2 = 46

% mass of Na in Na2SO4Na_2SO_4

32.4%

46142×100=\frac{46}{142} \times 100 =

32.4%

First step to find % composition

Find the relative atomic masses (Ar)

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Relative atomic mass

Relative formula Mass

Percentage composition example

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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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