2 Fe2S3 + 9 O2 → 2 Fe2O3 + 6 SO2 When 26.62 moles of Fe2S3 reacts with 63.63 moles of O­2, how many moles of SO2 are formed?

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.)

Chemistry worksheet - i am not sure what they are asking for exactly?

Why dose heating increase the speed at which a solution dissolved in water