A particular type of stainless steel contains 11.0% chromium by mass and has a density of 7.91 g/cm3. a) Calculate the number of chromium atoms in a 2.0 cm by 1.0 cm by 7.0 cm piece of this stainless steel. b) Calculate the number of 52Cr atoms in the above sample. The natural abundance of 52Cr is 83.789%.