Molecular formula example (Edexcel GCSE Chemistry): Flashcards

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Molecular formula example
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Empirical formula (example)

CH3CH_3

Molecular formula (example)

C2H6C_2H_6

RFM of CH3CH_3

15

RFM of C2H6C_2H_6

30

RFM calculation for CH3CH_3

(12×1)+(1×3)=15(12 \times 1)+(1 \times 3)=15

Finding conversion factor method

Divide molecular RFM by empirical RFM

Conversion factor (30÷1530 \div 15)

2

C atoms in CH3CH_3

1

H atoms in CH3CH_3

3

Getting molecular from empirical formula

Multiply each atom by conversion factor

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