Flashcards
2.2 Relative mass
Cards in this deck (5)
- 1What is relative isotopic mass?Mass of an isotope relative to 1/12th of the mass of an atom of carbon-12.
- 2What is relative atomic mass?Weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12.
- 3What is the basic principle of mass spectrometer?1) Sample is placed in the mass spectrometer.
2) The sample is vapourised and then ionised to form postive ions.
3) Ions are accelerated. Heavier ions move more slowly and are more difficult to deflect than lighter ions, so the ions of each isotope are seperated.
4) Ions are detected on a mass spectrum as a mass to charge ratio. Each ion reaching the detector ads to the signal, so the greater the abundance the larger the signal. - 4How to work of mass of charge ratio from mass spec?mass-to-charge ratio = relative mass of ions / relative charge on ions
- 5RAM of chlorine 35Cl of 75.78 37Cl of 24.22(75.78x35)+(24.22)x37)
___________________________
100
= 35.4844 = 35.5 to 1 d.p
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- A level Chemistry (Module 2: Foundations in Chemistry) Flashcards on 2.2 Relative mass, created by Urvi B on 13/11/2017.
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- Urvi B
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