How can u change cm to dm

What is the formula for calcium iodide

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?

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.