Making it through flight-attendant training is no picnic either, and flunking out results in not getting hired, Annette Long, a flight attendant with 13 years of experience, tells Business Insider.
Using a technique first devised by Karplus and Berger in 1970, a second part was added to the volume displacement task. The full task is done with three graduated cylinders with equal amounts of water and three marbles. The marbles have the following characteristics: The first marble is a large glass marble (18.5g). The second marble is a large steel marble, the same volume as the glass marble but more massive or heavier (66g). The third marble is a small steel marble, much smaller than the glass marble but the same mass or weight as the glass marble (18.5g). The protocol is as follows. The subjects are shown all three marbles and cylinders with water.
One mole of carbon atoms has a mass of exactly 12 g. Because magnesium atoms each have twice the mass of carbon atoms (24 Mg compared with 12 C), one mole of magnesium has a mass of 24 g. In fact, one mole of any element has a mass in grams that is equal to its relative atomic mass. One mole of iron has a mass of 56 g. Moles of compounds A mole of a molecular compound contains 6 x 10 23 molecules. It has a mass that is equal to its relative formula mass. So a mole of water (H 2 O) has a mass of 18 g. A mole of carbon dioxide (CO 2) has a mass of 44 g.