Alump of pure copper weighs 25.305 g in air and 24.486 g when submerged in water (rho = 0.9982 g/ml) at 20°c. suppose the copper is then rolled into a 248 cm2 foil of uniform thickness. what will this thickness be, in millimetres?

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.)