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An isotope of magnesium ABC having a mass number of 24.25 and 26 with percentage abundance of 10.1%,11.3%. calculate relative atomic mass of magnesium
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Relative atomic mass of magnesium  :

To have the answer you have to multiply the 3 masses by their respective abundance , but first convert percentage to the decimal equivalent , then add the results together.

24 × 0.101=2.424

25 ×0.113=2.825

= 2.424+2825= 5.249 g/mole.

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