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If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

How have the greenhouse gasses increased from the year 2000 to 2018

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?