1. A wooden object found in an Indian burial ground and subjected to radiocarbon dating. The decay rate associated with C-14 is 10 disintegrations per minute per gram carbon. What is the age of the object? 2. Co-60 is used extensively in radiotherapy as a source of y-rays. Its half-life is 5.27 years. a) How many years will it take to decrease to 35% of its original activity? b) If a cobalt source is ten years old, what percent of its original activity remains ? 3. A 1.50 g sample of a compound containing only C.H and O was bumed completely. The only combustion products were 1.738 g CO2 and 0.711 g of water. What is the empirical formula and molecular formula of the compound? (MW S 152 g/mol) 4. Heptane is bumed with 35% excess air. Find the composition of the flue gas if combustion is complete. 5. Determine the cell potential of the following system: a Pb/PbSO4//Pb2+/Pb b) Fe2+/Fe3+//MnO2/Mn2+