How do scientists organize their knowledge and understanding of concepts?

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

How many moles are in 43.9 l of oxygen

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !