OCR AS Chemistry Salters B - Amount of Substance
- Created by: Abigail Devon Sawyer
- Created on: 05-12-12 13:49
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- Amount of Substance
- Avagadros' Constant
- 6.02 x 10^23
- tells you the number of particles in 1 mole of a substance
- Relative Atomic Mass (Ar)
- tells you the number of times an atom of an element is heavier than one twelth of Carbon-12
- it is the weighted average of the relative isotopic masses for an element (therefore are not always whole numbers)
- is the average mass of 100 atoms of the same element
- Relative Formula Mass (Mr)
- the sum of the Relative Atomic Masses for each atom in a formula
- Empirical Formula
- tells you the simplest ratio of each element in a compound
- 1- divide the mass of each element by its relative atomic mass
- 2- divide these answers by the smallest answer you obtained in step 1
- 3- this will give you a 1:? ratio
- Molecular Formula
- tells you the actual number of atoms of each element in a molecule
- Avagadros' Constant
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