How many oxygen molecules are in a flask that contains 1.43 grams of oxygen?

(1.43 g O2) / (31.99886 g O2/mol) x (6.022 x 10^23 molecules/mol) = 2.69 × 10^22 molecules O2

answer; i believe that the correct answer is (c) explore the outer planets; / plz check good luck

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).