How many grams of lactic acid (C, H,O) are in 1 liter of a 0.5M solution of lactic acid? And how many grams of lactic acid are in the above solution?

a mole of lactic acid = 90 g

a 0.5 M solution would require 1/2 mol or 45 g

Explanation:

The molecular mass is 90 d, the combined atomic masses of its atoms.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.