Moles and Moletown


The mole (abbreviated as "mol") is an essential unit of measurement in chemistry. This unit measures how much of an atom, molecule, or ion is present. Until May of 2019, the mole was defined as the quantity of atoms present in twelve grams of carbon-12. Many students are confused by moles because they are a new unit that they have to understand. Using what is called "Avogadro's number," the mole is numerically stated as 6.02 x 10^23 units. The exact unit depends on what the problem asks, so it might be molecules, atoms, or something else. One type of question popular among chemistry teachers involves converting moles to grams. For example, you may be asked something like: how many grams of water are there in 0.5 moles of H20. To do this problem, we need to look at "Moletown," the