How many atoms in 5.5 moles? How many moles is 4.6 x 10^24 sulfur atoms? In this video Tyler DeWitt helps you solve problems like these--converting back and forth between moles and the number of atoms or molecules. DeWitt will use both a common sense approach, and also a standard conversion factor method. Learn how to use a scientific calculation to do this math, and see how to round answers with scientific notation and significant figures. [14:00]