Prior to the industrial revolution, the activity per unit mass of atmospheric carbon due to the presence of 14c had an average value of 0.255 bq per gram a) naturally occurring carbon in the pre-industrial atmosphere contained atomic abundances of 98.93% 12c and 1.07% 13c (atomic mass 13.0033548378 u), both of which are stable, and trace amounts of 14c. ignoring the 14c, calculate the total number of 1c and 1c atos in 1.00 g of carbon. b) using the average activity per gram of carbon, calculate the number of c atoms in 1.00 g of carbon in the pre-industrial atmosphere. c) when an organism dies, it no longer absorbs atmospheric carbon. after that, as the c in its cells decay, the total mass of carbon decreases. calculate the mass loss after all the c decays in a sample that originally had 1.00 g of pre-industrial carbon. 14 d) a sample of wood from an archaeological site currently contains 0.500 kg of carbon and produces 3070 ? - decays per ine. assuming that the sample died prior to the industrial revolution, calculate its age.