C3H8 + 5O2 → 3CO2 + 4H2O If 55.5 g C3H8 reacts with excess O2, how many grams of CO2 would be produced?

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.

so what is the problem with your lab report and whats the subject of the lab report? i will you