How many grams are in 8.20 x 10/22 molecules of Dinitrogen Hexaiodide?

When the volume and number of particles of a gas are constant which of the following is also constant

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride

What is happening when the water inside a kettle heats up and begins to boil