A device that shows continuous change is

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

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?

Chemistry worksheet - i am not sure what they are asking for exactly?