The

system provides attachment surfaces for
muscles.

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?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?