This exercise uses the radioactive decay model.

a wooden artifact from an ancient tomb contains 80% of the carbon-14 that is present in living trees. how long ago was the artifact made? (the half-life of carbon-14 is 5730 years. round your answer to the nearest whole number.)

i need the answer in yrs.

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.