A sample of chlorine contains two different isotopes, one with a mass of 35 and one with a mass of 37. The relative (average) atomic mass of the chlorine atoms in the sample is 35.5. What does this tell you about the amounts of each isotope in the sample?

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 !