The Atomic Mass of Al is 26.98154 g/mol. Is it possible to have 5.0 * 10^-25 g of Al? Explain.

If a mole of aluminum weighs 26.98 grams, that means 1 atom of aluminum weighs = (26.98 g/mole) / (6.023 x 10^23 atoms/mole) = 4.479 x 10^-23 grams,

so, it is not possible because 1 atom weighs that much we calculated which is almost 100 times more than the amount you mentioned