Natural gas, which you may assume to be pure methane, is burned in a furnace for space-heating purposes. (a) If twice the minimum 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

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.