Aluminum has a density of 2.70 g/ml. calculate the mass (in grams) of a piece of aluminum having a volume of 276 ml .

The reaction q+r2=r2q is found to be first order in r2 and

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

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