The world's longest ongoing war. For more than 60 years, Karen rebels have been fighting a civil war against the government of Myanmar. In February 1949, members of the Karen ethnic minority launched an armed insurrection against Myanmar's central government.
In Chemistry the quantities of a dozen, a century, a gross, ream and millennium are far too small. Even a million is too small. One million atoms of iron weighs 0.0000000000000000928 grams! Chemistâs measure atomic particles using a large QUANTITY called the mole. One mole is equal to 602214179000000000000000 or 6.022 x 1023 particles.
A mole is simply a unit of measurement. Units are invented when existing units are inadequate. Chemical reactions often take place at levels where using grams wouldn't make sense, yet using absolute numbers of atoms/molecules/ions would be confusing, too. Like all units, a mole has to be based on something reproducible. A mole is the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. That number of particles is Avogadro's Number, which is roughly 6.02x1023. A mole of carbon atoms is 6.02x1023 carbon atoms.