Please someone answer asap Explain why the mass of an object cannot help you identify what material the object is made from but the density of the object can be used to identify the material.

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution?

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.