find the heat of formation for the following reaction and determine whether or not yhe reaction is endothermic or exothermic and if the reaction is favorable or not

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

answer; /// i do believe that the correct answer is (a) boiling

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa