Difference between revisions of "Relative Formula Mass"
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==Key Stage 4== | ==Key Stage 4== | ||
===Meaning=== | ===Meaning=== | ||
− | The '''relative formula mass''' ('''M<sub>r</sub>) of a [[molecule]] is the [[mass]] of one [[mole]] of | + | The '''relative formula mass''' ('''M<sub>r</sub>''') of a [[molecule]] is the [[mass]] of one [[mole]] of [[molecule]]s. |
+ | NB One [[mole]] is [[Avogadro Constant|6.02x10<sup>23</sup>]] [[molecule]]s. | ||
+ | |||
===About Relative Formula Mass=== | ===About Relative Formula Mass=== | ||
+ | : The '''relative formula mass''' is used to find the [[mass]] of a [[molecule]] needed to perform a complete [[Chemical Reaction|reaction]] with another [[chemical]]. | ||
+ | |||
+ | ===Calculating Relative Formula Mass=== | ||
: '''Relative formula mass''' can be calculated from the [[Chemical Formula|chemical formula]] of the [[molecule]] and the [[Relative Atomic Mass|relative atomic mass]] of the [[element]]s. | : '''Relative formula mass''' can be calculated from the [[Chemical Formula|chemical formula]] of the [[molecule]] and the [[Relative Atomic Mass|relative atomic mass]] of the [[element]]s. | ||
− | : | + | |
+ | {| class="wikitable" | ||
+ | |- | ||
+ | | style="height:20px; width:275px; text-align:center;" |Find the '''relative formula mass''' of O<sub>2</sub>. | ||
+ | | style="height:20px; width:275px; text-align:center;" |Find the '''relative formula mass''' of CO<sub>2</sub> | ||
+ | | style="height:20px; width:275px; text-align:center;" |Find the '''relative formula mass''' of C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> | ||
+ | |- | ||
+ | | style="height:20px; width:275px; text-align:left;" | | ||
+ | [[Relative Atomic Mass]] of [[Oxygen]] = 16g | ||
+ | |||
+ | No. [[Oxygen]] [[atom]]s = 2 | ||
+ | |||
+ | '''M<sub>r</sub>''' of O<sub>2</sub> = 16x2 | ||
+ | |||
+ | '''M<sub>r</sub>''' = 32g | ||
+ | |||
+ | | style="height:20px; width:275px; text-align:left;" | | ||
+ | [[Relative Atomic Mass]] of [[Carbon]] = 12g | ||
+ | |||
+ | [[Relative Atomic Mass]] of [[Oxygen]] = 16g | ||
+ | |||
+ | No. [[Carbon]] [[atom]]s = 1 | ||
+ | |||
+ | No. [[Oxygen]] [[atom]]s = 2 | ||
+ | |||
+ | '''M<sub>r</sub>''' of CO<sub>2</sub> = 12x1 + 16x2 | ||
+ | |||
+ | '''M<sub>r</sub>''' = 44g | ||
+ | |||
+ | | style="height:20px; width:275px; text-align:left;" | | ||
+ | [[Relative Atomic Mass]] of [[Carbon]] = 12g | ||
+ | |||
+ | [[Relative Atomic Mass]] of [[Hydrogen]] = 1g | ||
+ | |||
+ | [[Relative Atomic Mass]] of [[Oxygen]] = 16g | ||
+ | |||
+ | No. [[Carbon]] [[atom]]s = 6 | ||
+ | |||
+ | No. [[Carbon]] [[atom]]s = 12 | ||
+ | |||
+ | No. [[Oxygen]] [[atom]]s = 6 | ||
+ | |||
+ | '''M<sub>r</sub>''' of C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> = 12x6 + 1x12 + 16x6 | ||
+ | |||
+ | '''M<sub>r</sub>''' = 180g | ||
+ | |} | ||
+ | |||
+ | ===References=== | ||
+ | ====AQA==== | ||
+ | |||
+ | :[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Relative formula mass (Mr), pages 64-5, GCSE Chemistry, Hodder, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10240 ''Relative formula mass, M, page 123, GCSE Combined Science; The Revision Guide, CGP, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d229 ''Relative formula mass, M, pages 41-48, GCSE Chemistry; The Revision Guide, CGP, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/0008158762/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158762&linkCode=as2&tag=nrjc-21&linkId=a0fffa35b3ea49a63404f6704e0df7cc ''Relative formula mass, pages 100-1, 106-8, 115-7, 120-3, 125, 167, GCSE Chemistry; Student Book, Collins, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/178294639X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294639X&linkCode=as2&tag=nrjc-21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Relative formula mass, pages 104-108, 114-117, GCSE Combined Science Trilogy; Chemistry, CGP, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Relative formula mass, pages 110-114, 120-124, GCSE Chemistry, CGP, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Relative formula mass, pages 177-8, GCSE Combined Science Trilogy 1, Hodder, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Relative formula mass, pages 62-63, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | ||
+ | |||
+ | ====Edexcel==== | ||
+ | |||
+ | :[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Relative formula mass, page 72, GCSE Chemistry, Pearson, Edexcel ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Relative formula masses, pages 27, 28, GCSE Chemistry; The Revision Guide, CGP, Edexcel ''] | ||
+ | :[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 ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Relative formula masses, pages 90, 91, GCSE Combined Science; The Revision Guide, CGP, Edexcel ''] | ||
+ | |||
+ | ====OCR==== | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Relative formula mass (Mr), page 104, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Relative formula mass (Mr), pages 31, 38, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Relative formula mass, pages 37, 39, Gateway GCSE Chemistry, Oxford, OCR ''] |
Latest revision as of 18:04, 18 December 2019
Contents
Key Stage 4
Meaning
The relative formula mass (Mr) of a molecule is the mass of one mole of molecules.
NB One mole is 6.02x1023 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 Mr of O2 = 16x2 Mr = 32g |
Relative Atomic Mass of Carbon = 12g Relative Atomic Mass of Oxygen = 16g Mr of CO2 = 12x1 + 16x2 Mr = 44g |
Relative Atomic Mass of Carbon = 12g Relative Atomic Mass of Hydrogen = 1g Relative Atomic Mass of Oxygen = 16g Mr of C6H12O6 = 12x6 + 1x12 + 16x6 Mr = 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