Question

A sample of magnesium is found to contain 78.70% of 24Mg atoms (mass 23.98 amu),
10.13% of 25Mg atoms (mass 24.99 amu), and 11.17% of 26Mg atoms (mass 25.98 amu).
Calculate the average mass of a Mg atom. An ion of platinum has a mass number of 195 and
contains 74 electrons. How many protons and neutrons does it contain, and what is its charge?

Answer 1

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