grains of fine california beach sand are approximately spheres with an average radius of 78(mew,m) and are made of silicon dioxide. A solid cube of...

grains of fine california beach sand are approximately spheres with an average radius of 78(mew,m) and are made of silicon dioxide. A solid cube of silicon dioxide with a volume of 1.00 m^3 has a mass of 2600 kg. What mass of small sand grains would have a total surface area (the total area of all individual spheres) equal to the surface area of a cube 1.00m on an edge?