Poly(lactic acid) (pla) has received much recent attention because the lactic acid monomer [ch3ch(oh)cooh] from which it is made can be obtained from carbohydrates rather than petroleum. this makes pla a more "environmentally friendly" polyester. select the correct structure of pla.

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?

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius

What is the molecular weight of copper