Bismuth selenide, Bi₂Se₃, is used in semiconductor research. It can be prepared directly from its elements by the reaction, 2 Bi + 3 Se → Bi₂Se₃. Suppose that you need 5 kg of bismuth selenide for a prototype system you are working on. You find a large bottle of bismuth metal but only 560 g of selenium. Describe how you can calculate if you have enough selenium on hand to carry out the reaction or if you need to order more.