What is the total number of moles of solute in 250 milliliters of a 1.0 m solution of nacl

What substance has a mass of 9.5g and volume of 2.1cm^3

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 !

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?