Relative Masses - Module 2.1.1 - OCR - AS CHEMISTRY

Relative Mass - Module 2.1.1 - OCR - AS Chemistry -

pg 12-14

Carbon-12

• atomic mass = u
• Mass of carbon-12 isotope = 12 atomic mass units/ 12u/ 12amu
• Standard mass for atomic mass

                           = 1u or 1/12th of an atom of carbon-12

RELATIVE ISTOPIC MASS = MASS OF AN ISOTOPE RELATIVE TO 1/12th OF THE MASS OF AN ATOM OF CARBON-12

• most elements contains a mixture of isoptopes
• therefore you need to work out…