How many nitrogen molecules are in 3.36 L of nitrogen gas at STP?

What is the subscript for oxygen in its molecular formula

Connect the whole numbers on the periodic table to indicate what they represent?

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 !