Natural gas, which you may assume to be pure methane, is burned in a furnace for space-heating purposes. (a) If twice the minimu
m of air is used for the combustion, and if the methane and air are initially at 20 C and the stack gases, including all of the water and vapor, are at 100 C, how much heat is liberated per mole of methane burned
I'm guessing the photo means photosynthesis. In that case, it is solar energy to chemical energy. Radiant energy and solar energy is kind of the same thing, so 4th answer.
