Originally Posted by

**massid** Being a chemistry major, i thought i understood what what going on in this problem! i was very discouraged to learn that i was wrong! If you can help...that would be great!

Grains of fine California beach sand are approximately spheres with an average radius of 50 *μ*m and are made of silicon dioxide, which has a density of 2.7 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual spheres) equal to the surface area of a cube 1.2 m on an edge?