chemistry elements?

An archaeologist finds a box in a temple ruin whose age he wants to determine using radiocarbon dating. Using a scale, he determines the box's mass and calculates that at the time of its formation, the box contained approximately 78,000 billion C-14 atoms. Plot the number of C-14 atoms contained in the box as a function of time in a coordinate system. The period between 0 and 12,339 years after its formation is to be represented, with a step size of 900 years. It is particularly useful to use the unit "atoms" for the c-axis scale; then the numbers are not so large. You don't have to write down a table of values; you can start drawing right away. Calculate how many C-12 atoms will still be present in the box 4,000 years after its formation. Provide your calculation method. A laboratory test determines that at the time of its discovery, the box contains only 400 billion carbon-14 atoms. Determine the approximate age of the box using your diagram from subtask b) and then again using an exact calculation. Plot your readings on the diagram.