3) How many grams are in each elemental sample? a. 3.01 mol Pt

b. 7.9 mol Rb

c. .248 mol Cu

hellwo?? hi its me doug who are you what is 3+7= i really need help this is soo hard

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.