What is the molarity of a solution if you take 12.0 grams of ca(no3)2 and mix it with 0.105 l of water?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which type of fossil does this image depict?

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 !