A cube of gold that is 1.00 cm on a side has a mass of 19.3 g. A single gold atom has a mass of 197.0 amu. (a) How many gold atoms are in the cube? (b) From the information given, estimate the diameter in Å o ? f a single gold atom. (c) What assumptions did you make in arriving at your answer for part (b)?

Solution : Step 1 : Gold is a chemical element having symbol Au. It has an atomic number of 79. Here, in the problem given : Side of gold cube = 1.00cm. Mass of gold cube = 19.3g. Mass of gold atom = 197.0 amu.