Difference between revisions of "Relative Formula Mass"

Revision as of 06:57, 28 November 2019

Key Stage 4

Meaning

The relative formula mass (M_r) of a molecule is the mass of one mole of molecules.

About Relative Formula Mass

The relative formula mass is used to find the mass of a molecule needed to perform a complete reaction with another chemical.

Calculating Relative Formula Mass

Relative formula mass can be calculated from the chemical formula of the molecule and the relative atomic mass of the elements.

Find the relative formula mass of O₂.	Find the relative formula mass of CO₂	Find the relative formula mass of C₆H₁₂O₆
Relative Atomic Mass of Oxygen = 16g No. Oxygen atoms = 2 M_r of O₂ = 16x2 M_r = 32g	Relative Atomic Mass of Carbon = 12g Relative Atomic Mass of Oxygen = 16g No. Carbon atoms = 1 No. Oxygen atoms = 2 M_r of CO₂ = 12x1 + 16x2 M_r = 44g	Relative Atomic Mass of Carbon = 12g Relative Atomic Mass of Hydrogen = 1g Relative Atomic Mass of Oxygen = 16g No. Carbon atoms = 6 No. Carbon atoms = 12 No. Oxygen atoms = 6 M_r of C₆H₁₂O₆ = 12x6 + 1x12 + 16x6 M_r = 180g

References

AQA

Relative formula mass (Mr), pages 64-5, GCSE Chemistry, Hodder, AQA

Relative formula mass, M, page 123, GCSE Combined Science; The Revision Guide, CGP, AQA

Relative formula mass, M, pages 41-48, GCSE Chemistry; The Revision Guide, CGP, AQA

Relative formula mass, pages 100-1, 106-8, 115-7, 120-3, 125, 167, GCSE Chemistry; Student Book, Collins, AQA

Relative formula mass, pages 104-108, 114-117, GCSE Combined Science Trilogy; Chemistry, CGP, AQA

Relative formula mass, pages 110-114, 120-124, GCSE Chemistry, CGP, AQA

Relative formula mass, pages 177-8, GCSE Combined Science Trilogy 1, Hodder, AQA

Relative formula mass, pages 62-63, GCSE Chemistry; Third Edition, Oxford University Press, AQA

Edexcel

Relative formula mass, page 72, GCSE Chemistry, Pearson, Edexcel

Relative formula masses, pages 27, 28, GCSE Chemistry; The Revision Guide, CGP, Edexcel

Relative formula masses, pages 71, 85, GCSE Chemistry, CGP, Edexcel

Relative formula masses, pages 90, 91, GCSE Combined Science; The Revision Guide, CGP, Edexcel

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+:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Relative formula masses, pages 71, 85, GCSE Chemistry, CGP, Edexcel '']
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