CIE A Level Chemistry复习笔记4.1.3 Isotopic Abundance & Relative Atomic Mass

Calculating Relative Atomic Mass

  • Isotopes are different atoms of the same element that contain the same number of protons and electrons but a different number of neutrons.
    • These are atoms of the same elements but with different mass numbers
  • Because of this, the mass of an element is given as relative atomic mass (Ar) by using the average mass of the isotopes
  • The relative atomic mass of an element can be calculated by using the relative abundance values
    • The relative abundance of an isotope is either given or can be read off the mass spectrum

3.-Calculating-Relative-Atomic-Mass-equation-1

Worked example: Calculating relative atomic mass of oxygen

4.1-Analytical-Techniques-Worked-example-Calculating-relative-atomic-mass-of-oxygen

Answer

The correct answer is 1

3.-Calculating-Relative-Atomic-Mass-worked-example-equation-1

= 16.0044

= 16.00

Worked example: Calculating relative atomic mass of boron

4.1-Analytical-Techniques-Worked-example-Calculating-relative-atomic-mass-of-boron

4.1-Analytical-Techniques-Mass-Spectrum-Boron

Answer

3.-Calculating-Relative-Atomic-Mass-worked-example-equation-2

 

 

 

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