Final answer:
One mole of magnesium weighs 24 grams, which is equal to the atomic weight of magnesium.
Step-by-step explanation:
The student has asked how much one mole of magnesium weighs. Avogadro's number, NA, is 6.02 × 10²³, which is the number of particles in one mole of a substance. The atomic weight of magnesium is given as 24. Avogadro's number informs us that one mole of any substance contains the same number of particles (atoms or molecules), and a mole's mass in grams is equal to its atomic or molecular mass.
Therefore, to answer the question: one mole of magnesium weighs the same as the atomic weight of magnesium in grams. Since the atomic weight of magnesium is 24, one mole of magnesium weighs 24 grams.