Calculating Numbers of Molecules and Atoms from Mass (a) How many glucose molecules are in 5.23 g of C6H1206? (b) How many oxygen atoms are in this sample? How many chlorine atoms are in 12.2 g of CCI4? (a) 4.77 * 1022 (b) 7.34 * 1024 (c) 1.91 * 1023 (d) 2.07 x 1023.
Answer : Step 1: The number of atoms of a particular atom in a given mass of a compound will be determined by the following procedure: First, calculate the total number of moles of the compound in the given mass. Then, multiply the number of moles of that compound with the number of atoms of that particular element in one molecule of the compound. This will give the total number of moles of that particular atom in the given mass of the compound. Now, multiply this total number of moles of that atom with the Avogadro's number to get the total number of atoms of particular element.