What are the number of molecules in 2.56 moles of water?

What layer of the atmosphere is directly above the troposphere?

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both