Carbon-12 Memes

Chemistry teachers everywhere are screaming! The top panel shows the technically correct but utterly chaotic definition that mole is the number of atoms in 1 gram of hydrogen (which is approximately 6.022 × 10 23 ). Meanwhile, the bottom panel reveals the elegant, precise definition: a mole contains as many elementary entities as there are atoms in exactly 12 grams of carbon-12. It's like choosing between explaining directions using landmarks versus GPS coordinates. The precision-hungry chemist in all of us is nodding vigorously at the bottom panel right now.