Given the balanced equation: 2Na + S → Na2S
What is the total number of moles of S that reacted when
4.0 moles of Na were completely consumed?

A)0.5 mole
B)1.0 mole
C)2.0 moles
D)4.0 moles

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.