What did alchemists contribute to the development of chemistry?

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.

What additive are in a lavender tube for phlebotomists