How many molecules of aspirin (formula mass 180amu) are in a 0.500g sample?

After cloud droplets form, what must happen to them for precipitation to occur?

How hot is the suns corona? (integrated science)

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.