In order to find the total value of grams of Platinum element, we need to calculate it by using the number of moles given in the question, 13.5 moles, and also the atomic mass of this element, which is 195.084 grams/moles
195.084g = 1 mol of Platinum
x grams = 13.5 moles of Platinum
x = 195.084 * 13.5
x = 2634 grams of Platinum element in 13.5 moles