In an experiment, you are to combine iron with an excess of sulfur and heat the mixture to obtain iron(III) sulfide.

2Fe(s) + 3S(s) Fe2S3(s)

What experimental information must you collect in order to calculate the percent yield of this reaction?

Which of the following happens during cell division? (a) energy is created (b) waste is eliminated (c) carbon dioxide is released (d) damaged cells are replaced

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution