Draw and label a model of the flow of energy of an ice cube dropped into a container of warm water. The ice is the system and the warm water is the surrounding. ( Can you Please draw so I can send to my teacher )

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )