A piece of wood is know to be 34,320 years old. At the present time, the wood contains 4.0 g of radiocarbon. How much carbon-14 was in the wood originally? The half-life of carbon-14 is 5,720 y.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

a:

by the combination of an unlimited number of elements