V. 1.25 g of sodium, 92% purity, are placed in a glass tube containing chlorine gas. A solid, white substance forms on the walls of the tube, and the tube heats up. a) Write the equation of the reaction that takes place when sodium is introduced into chlorine. b) Specify the type of reaction between sodium and chlorine, analyzing the heat exchange with the external environment. ) Calculate the mass of sodium chloride formed in the reaction.​