When sodium chloride is strongly heated in a flame, the flame takes on the yellow color associated with the emission spectrum of sodium atoms. the reaction that occurs in the gaseous state is na^+(g) + cl^- (g) > na (g) + cl (g) calculate ? h for this reaction. (kj/mol)

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.