Hello pls help me e. The element carbon-14, which is used in dating very old objects, was discovered in 1940 by Martin Kamen and Sam Ruben. Its atomic mass is 2.324728 x 10-20 kg. If one atom of carbon-14 has 6 electrons and 6 protons, find the number of neutrons in one atom of the element. Show your working. f. Because individual atoms are so small, they are often grouped together in a larger amount, called a mole. The number of atoms in a mole of a substance is 6.02 x 1023, which is referred to as Avogadro's number. If one mole of water has a mass of 18 g, find the number of atoms in 1000 grams (1 liter) of water. g. The distance from Earth to Mars is 54.6 million kilometres. A helium molecule has a length of approximately 280 picometers. Find how many helium molecules could fit between these two planets.