The atomic mass of an element represents the average mass of the atoms in a sample, taking into account the various isotopes and their abundances. Here are the atomic masses of magnesium, potassium, and carbon:
Magnesium (Mg): The atomic mass of magnesium is approximately 24.31 atomic mass units (amu).
Potassium (K): The atomic mass of potassium is approximately 39.10 atomic mass units (amu).
Carbon (C): The atomic mass of carbon is approximately 12.01 atomic mass units (amu).
Please note that these values are approximate and may vary slightly depending on the source and the isotopic composition of the element.