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To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.

Calculate cubic yards of concrete or the premixed bags needed for a slab, footing, or wall, or stairs project.

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Before knowing about how to calculate a percentage, let us know what a percentage is.

811e1 and Rb87 to be 2.

To calculate average atomic mass of an element, we use the formula: Now, putting the values of abundances and mass numbers of 2 isotopes in above equation, we get.

Isotope Atomic mass abundance (%) H1 1.

The average atomic mass between these two isotopes is 63.