What is the molarity of 5.60 mol of sodium carbonate in 1500 ml of solution?

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Find the mass, in grams, of 5.00*10^23 molecules of f2

The time that is taken by neptune once around the sun is called