For certain molecules, enthalpies of formation
can be determined from combustion data. Using the diagram below, calculate the enthalpy of formation of methane gas, CH4(g), and the enthalpies for two of the combustion reactions listed below.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?