What is the percent yield if the actual yield is 1.5g and the theoretical yield is 4.5g

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?

This drawing shows a human body system. what is the primary function of this body system?

Compare and contrast the bohr model and the electron cloud models of the atom.