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Description
Flashcards by lucy.wright73, updated more than 1 year ago
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Created by lucy.wright73
over 10 years ago
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| Question | Answer |
| What is used as the standard measurement of relative masses? | Carbon-12 |
| Define relative isotopic mass | The mass of an atom of an isotope, compared with one-twelfth of the mass of an atom of C-12 |
| Define relative atomic mass | The weighted mean mass of an atom of an element, compared with one-twelfth of the mass of an atom of C-12 |
| How do you calculate the relative atomic mass of an element from given abundances of isotopes? | Divide each percentage by 100 and multiply by its isotopic mass. Then add all these together. |
| What is the difference between relative molecular mass and relative formula mass? | RMM is for simple molecules e.g. H20. RFM is for formula units of giant structures (ionic/giant covalent e.g. SiO2) |
| Define relative molecular/formula mass | The weighted mean mass of a molecule/formula unit, compared with one-twelfth of the mass of an atom of C-12 |
| How do you find relative molecular/formula mass? | Add together the relative atomic masses of all atoms |
| How to calculate RAM using relative intensities of isotopes? | Divide each intensity by sum of all intensities, then multiply by the corresponding relative isotopic mass. Add all of these together |
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