.The chemical formula for table sugar is C12H11022. What can you tell from this formula?

The answer is: The ratio of oxygen atoms to hydrogen atoms in a molecule of sugar is 2 to 1.

Let me know if you need any other help:))

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

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.