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

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

What does the symbol (–hfus) indicate in a phase change?