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GCSE & A level Chemistry Calculations: Defining & calculating relative atomic mass
DEFINING & CALCULATING the RELATIVE ATOMIC MASS Ar of an element Doc Brown's Chemistry - GCSE/IGCSE/GCE (basic A level) O Level Online Chemical Calculations 1. Defining, explaining and calculating relative atomic mass RAM or Ar, also mention of relative isotopic mass Sub-index for page (a) Introduction - defining relative atomic mass - carbon-12 scale - isotopes (b) How to calculate relative atomic mass - examples explained (c) How to calculate relative atomic mass with accurate relative isotopic masses
(d) Table of relative atomic masses for elements 1 to 92 (2 decimal places) Spotted any careless error on my part? EMAIL query ? comment or request a type of GCSE calculation not covered? Self-assessment Quizzes on relative atomic mass:
type in answer
Revision notes on how to define relative atomic mass and how to calculate relative atomic mass from the percentage abundance of isotopes, help in revising for A level AQA, Edexcel, OCR 21st century, Gateway science GCSE 9-1 chemistry examinations |
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(a) Introduction - defining relative atomic mass - carbon-12 scale
Above is typical periodic table used in GCSE science-chemistry specifications and I've 'usually' used these values in my exemplar calculations to cover most syllabuses
(b) Examples of relative atomic mass calculations for GCSE 9-1/IGCSE/AS/A level chemistry students How do I calculate relative atomic mass? You can calculate relative atomic mass from isotopic abundances
(c) Examples for Advanced A Level Chemistry students only How to calculate relative atomic mass with accurate relative isotopic masses Using data from modern very accurate mass spectrometers
(a) Very accurate calculation of relative atomic mass (need to know and define what relative isotopic mass is) Relative
isotopic mass
is defined as the accurate mass of a single isotope of
an element compared to 1/12th the mass of a
carbon-12 atom e.g. the accurate relative isotopic mass of the cobalt-5
If we were to redo the calculation of the relative atomic mass of chlorine (example 1.1 above), which is quite adequate for GCSE purposes (and maybe A level too), but more accurately at A level, we might do ....
See also
(b) Calculations of % composition of isotopes It is possible to do the reverse of a relative atomic mass calculation if you know the Ar and which isotopes are present. It involves a little bit of arithmetical algebra. The Ar of boron is 10.81 and consists of only two isotopes, boron-10 and boron-11 The relative atomic mass of boron was obtained accurately in the past from chemical analysis of reacting masses but now mass spectrometers can sort out all of the isotopes present and their relative abundance.
so naturally occurring boron consists of 19% 10B and 81% 11B (the data books actually quote 18.7 and 81.3, but we didn't use the very accurate relative isotopic masses mentioned above!) Revision notes on how to define relative atomic mass and how to calculate relative atomic mass from the percentage abundance of isotopes, help in revising for A level AQA, Edexcel, OCR 21st century, Gateway science GCSE 9-1 chemistry examinations On other pages on Atomic structure and Relative Formula Mass Self-assessment Quizzes on relative atomic mass
type in answer
APPENDIX 1. A typical periodic table used in pre-university examinations
Above is typical periodic table used in GCSE science-chemistry specifications in doing chemical calculations, and I've 'usually' used these values in my exemplar calculations to cover most syllabuses Revision notes on how to define relative atomic mass and how to calculate relative atomic mass from the percentage abundance of isotopes, help in revising for A level AQA, Edexcel, OCR 21st century, Gateway science GCSE 9-1 chemistry examinations (d) APPENDIX 2. Table of relative atomic masses for elements 1 to 92 Notes: (i) The list of relative atomic mass are in alphabetical order by element name, together with chemical symbol and proton/atomic number. (ii) The relative atomic masses are quoted to two decimal places, though it is essential to be aware that values in pre-university examinations might be rounded to the nearest integer or one decimal place. (iii) Trans-uranium elements have been eliminated because their isotopic composition varies depending on the source e.g. cyclotron, nuclear reactor etc. AND all their isotopes are highly radioactive and most are very unstable (so your relative atomic mass changes all the time!) (iv) * radioactive, mass number of most stable isotope quoted
Revision notes on how to define relative atomic mass and how to calculate relative atomic mass from the percentage abundance of isotopes, help in revising for A level AQA, Edexcel, OCR 21st century, Gateway science GCSE 9-1 chemistry examinations relative atomic mass calculations how to calculate the relative atomic mass of bromine from the % percent abundance of isotopes, how to calculate the relative atomic mass of chlorine from the percentage abundance of isotopes, how to calculate the % composition of isotopes in an element given its relative atomic mass
OTHER CALCULATION PAGES
Keywords and phrases: What is the relative atomic mass of an element? What scale is relative atomic mass based on? What is the formula to work out the relative atomic mass of an element? Quantitative Chemistry calculations online Help for problem solving in relative atomic mass calculations. Definitions of relative atomic mass and relative isotopic mass (A level students only) Practice revision questions on working out relative atomic mass from isotopic composition (% isotopes, A level students will learn about very accurate mass spectrometer data). What is relative atomic mass? How do you calculate the relative atomic mass of an element. What is the standard mass unit? Relative atomic mass is explained below, with reference to the carbon-12 atomic mass scale and the relevance of isotopes and 'u' the unified atomic mass unit is explained. Detailed examples of the method of how to calculate relative atomic mass from the isotopic composition are fully explained with reference to the definition of the relative atomic mass of a compound. For A level students, how to define and use relative isotopic masses to calculate relative atomic mass. These notes on defining, explaining and calculating relative atomic mass and defining relative isotopic mass are designed to meet the highest standards of knowledge and understanding required for students/pupils doing GCSE chemistry, IGCSE chemistry, O Level chemistry, KS4 science courses and A Level chemistry courses. how to do relative atomic mass calculations Revision KS4 Science revising how to do relative atomic mass calculations Additional Science Triple Award Science Separate Sciences Courses aid to how to do relative atomic mass calculations textbook revision GCSE/IGCSE/O level Chemistry how to do relative atomic mass calculations Information Study Notes for revising for AQA GCSE Science how to do relative atomic mass calculations, Edexcel GCSE Science/IGCSE Chemistry how to do relative atomic mass calculations & OCR 21st Century Science, OCR Gateway Science how to do relative atomic mass calculations WJEC gcse science chemistry how to do relative atomic mass calculations CEA/CEA gcse science chemistry O Level Chemistry (revise courses equal to US grade 8, grade 9 grade 10 how to do relative atomic mass calculations) A level Revision notes for GCE Advanced Subsidiary Level how to do relative atomic mass calculations AS Advanced Level A2 IB Revising how to do relative atomic mass calculations AQA GCE Chemistry OCR GCE Chemistry how to do relative atomic mass calculations Edexcel GCE Chemistry Salters Chemistry how to do relative atomic mass calculations CIE Chemistry how to do relative atomic mass calculations, WJEC GCE AS A2 Chemistry how to do relative atomic mass calculations, CCEA/CEA GCE AS A2 Chemistry revising how to do relative atomic mass calculations courses for pre-university students (equal to US grade 11 and grade 12 and AP Honours/honors level how to do relative atomic mass calculations revision guide to how to do relative atomic mass calculations relative atomic mass of 1 Hydrogen H relative atomic mass of 2 Helium He relative atomic mass of 3 Lithium Li relative atomic mass of 4 Beryllium Be relative atomic mass of 5 Boron B relative atomic mass of 6 Carbon C relative atomic mass of 7 Nitrogen N relative atomic mass of 8 Oxygen O relative atomic mass of 9 Fluorine F relative atomic mass of 10 Neon Ne relative atomic mass of 11 Sodium Na relative atomic mass of 12 Magnesium Mg relative atomic mass of 13 Aluminium Al relative atomic mass of 14 Silicon Si relative atomic mass of 15 Phosphorus P relative atomic mass of 16 Sulphur S relative atomic mass of 17 Chlorine Cl relative atomic mass of 18 Argon Ar relative atomic mass of 19 Potassium K relative atomic mass of 20 Calcium Ca relative atomic mass of 21 Scandium Sc relative atomic mass of 22 Titanium Ti relative atomic mass of 23 Vanadium V relative atomic mass of 24 Chromium Cr relative atomic mass of 25 Manganese Mn relative atomic mass of 26 Iron Fe relative atomic mass of 27 Cobalt Co relative atomic mass of 28 Nickel Ni relative atomic mass of 29 Copper Cu relative atomic mass of 30 Zinc Zn relative atomic mass of 31 Gallium Ga relative atomic mass of 32 Germanium Ge relative atomic mass of 33 Arsenic As relative atomic mass of 34 Selenium Se relative atomic mass of 35 Bromine Br relative atomic mass of 36 Krypton Kr relative atomic mass of 37 Rubidium Rb relative atomic mass of 38 Strontium Sr relative atomic mass of 39 Yttrium Y relative atomic mass of 40 Zirconium Zr relative atomic mass of 41 Niobium Nb relative atomic mass of 42 Molybdenum Mo relative atomic mass of 43 Technetium Tc relative atomic mass of 44 Ruthenium Ru relative atomic mass of 45 Rhodium Rh relative atomic mass of 46 Palladium Pd relative atomic mass of 47 Silver Ag relative atomic mass of 48 Cadmium Cd relative atomic mass of 49 Indium In relative atomic mass of 50 Tin Sn relative atomic mass of 51 relative atomic mass of Antimony Sb relative atomic mass of 52 Tellurium Te relative atomic mass of 53 Iodine I relative atomic mass of 54 Xenon Xe relative atomic mass of 55 Caesium Cs relative atomic mass of 56 Barium Ba relative atomic mass of 57 Lanthanum La relative atomic mass of 58 Cerium Ce relative atomic mass of 59 Praseodymium Pr relative atomic mass of 60 Neodymium Nd relative atomic mass of 61 Promethium Pm relative atomic mass of 62 Samarium Sm relative atomic mass of 63 Europium Eu relative atomic mass of 64 Gadolinium Gd relative atomic mass of 65 Terbium Tb relative atomic mass of 66 Dysprosium Dy relative atomic mass of 67 Holmium Ho relative atomic mass of 68 Erbium Er relative atomic mass of 69 Thulium Tm relative atomic mass of 70 Ytterbium Yb relative atomic mass of 71 Lutetium Lu relative atomic mass of 72 Hafnium Hf relative atomic mass of 73 Tantalum Ta relative atomic mass of 74 Tungsten W relative atomic mass of 75 Rhenium Re relative atomic mass of 76 Osmium Os relative atomic mass of 77 Iridium Ir relative atomic mass of 78 Platinum Pt relative atomic mass of 79 Gold Au relative atomic mass of 80 Mercury Hg relative atomic mass of 81 Thallium Tl relative atomic mass of 82 Lead Pb relative atomic mass of 83 Bismuth Bi relative atomic mass of 84 Polonium Po 85 Astatine At relative atomic mass of 86 Radon Rn relative atomic mass of 87 Francium Fr relative atomic mass of 88 Radium Ra relative atomic mass of 89 Actinium Ac relative atomic mass of 90 Thorium Th relative atomic mass of 91 Protactinium Pa relative atomic mass of 92 Uranium U gcse chemistry revision free detailed notes on calculating relative atomic mass of an element to help revise igcse chemistry igcse chemistry revision notes on calculating relative atomic mass of an element O level chemistry revision free detailed notes on calculating relative atomic mass of an element to help revise gcse chemistry free detailed notes on calculating relative atomic mass of an element to help revise O level chemistry free online website to help revise calculating relative atomic mass of an element for gcse chemistry free online website to help revise 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