What is the mass of 3.45 moles of Aluminum sulfate?Can u explain how?
Aluminum sulfate is Al2S3, so you got two atoms of aluminum and three of oxygen. Hence the molar mass of aluminum sulfate is: 2X16 (two times molar mass of oxygen) + 3X32 (three times molar mass of sulfur). Keep in mind that the molar mass of an elements equals its mass number. We have 128 grams per mole or 128 pounds per lb-mol. Since you have 3.45 moles of Al2S3 you just have to do 3.45 times 128 = 441.6 grams