In 1951, fragments of charcoal from the excavation of the cave were analyzed. The charcoal sample had a specific activity of 2.34 d/min*g. In 2002, a new radiocarbon analysis on a reindeer antler baton was performed. The antler sample had a specific activity of 1.56 d/min*g. The ratio of 12C/14C for living organisms results in a specific activity of 15.3 d/min*g. The half-life for 14C is ~5730 years. Calculate the age that was determined for both the 1951 and the 2002 analysis. Please show your work.

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?