Consider the balanced chemical reaction below. When the reaction was
carried out, the calculated theoretical
yield for iron(III) sulfide was 16.8
grams, but the measured yield was
11.6 grams. What is the percent yield?
2FeBr3 + 3Na2S → Fe2S3 +6NaBr

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.)

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

State one important difference between a physical change and a chemical change?