1) A ring made out of platinum (Pt) metal has a mass of 0.675 g. (2 points) a) Calculate the number of Pt moles found in this ring. (Hint: Periodic table!) Show work. Include units and observe proper sig figs. b) Calculate the number of Pt atoms found in this ring. Note: Avogadro's number = 6.022 x 102 Show work. Include units and observe proper sig figs. 2) A given crystalline substance was found to have 2.05 x10 atoms of lithium (Li) in it. (2 points) a) Calculate the number of Li moles found in this crystal. Note: Avogadro's number =6022 x 103 Show work. Include units and observe proper sig figs. b) Calculate the mass (in grams) of Li found in this crystal. (Hint: Periodic table!) Show work. Include units and observe proper sig figs