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Isotopes Relative Atomic Mass (RAM)

Last modified by
on
Sep 12, 2022, 2:30:16 PM
Created by
on
Mar 24, 2015, 12:53:42 PM
iRAM=(A100)⋅a+(B100)⋅b+(C100)⋅c
(A)1st Ratio
(a)1st Mass
(B)2nd Ratio
(b)2nd Mass
(C)3rd Ratio (Enter ZERO if No 3rd Ratio)
(c)3rd Mass (Enter ZERO if No 3rd Mass)
Tags
Chemistry Atomic Isotopes
UUID
cccfd7dd-d224-11e4-a3bb-bc764e2038f2

The Isotopes Relative Atomic Mass (RAM) calculator returns the relative mass based on the ratios and masses of multiple isotopes.

INSTRUCTIONS: Choose units and enter the following:

  • (R1) Percent Ratio of Isotope 1
  • (M1) Atomic Mass of Isotope 1
  • (R2) Percent Ratio of Isotope 2
  • (M2) Atomic Mass of Isotope 2
  • (R3) Percent Ratio of Isotope 3  (Default is zero)
  • (M3) Atomic Mass of Isotope 3

Isotope Relative Atomic Mass (iRAM): The calculator returns the mass in atomic units (u).  However, this can be automatically converted to compatible units via the pull-down menu.  NOTE: The three ratios must sum to 100%.

The Math / Science

This equation calculates the Relative Atomic Mass of an Isotope given the mass and %Abundance of the Isotopes. Enter Zero (0) in the last two fields if you do not have a third Isotope.

RAM =  (Abundance x Atomic weight) + (Abundance x Atomic weight) + (Abundance x Atomic weight)

where:

  • RAM = Relative Atomic Mass
  • Abundance = Ratio of the Isotope
  • Atomic Weight = Atomic Weight of Isotope

 
This equation, Isotopes Relative Atomic Mass (RAM), is used in 2 pages
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