3. For the following 2-step sequence, trans-stilbene stilbene dibromide diphenylacetylene C14H12 180.25g/mol C14H12Br2 340.06g/mol C14H10 50mg yield =80mg yield =35mg a. Given that the reaction started with 50mg and used an excess of other all other reagents, what is the percent yield for step 1 ? For step 2? Overall yield for both steps? b. How many grams of product (diphenylacetylene) is predicted, using the percent yield in part a, when 250mg of trans-stilbene is used? 4. For the following reaction, salicylic acid C7H6O3 138.12g/mol acetic anhydride aspirin acetic acid 102.09g/mo 180.16g/mol C2H4O2 60.05g/mol a. What volume of acetic anhydride (d=1.08g/mL) is required to obtain 1.00g of aspirin? b. What mass of salicylic acid is required to obtain 1.00g of aspirin? c. How much acetic acid (in mL ) is produced when 2.00g of aspirin is synthesized