Based on known laws of gravity, which of the following two statements are true?

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

How many electrons does each element require in its valence shell to become stable?

Five structural isomers have the formula c6h14. where needed, draw the structure and give the iupac name of all five isomers.