Molecules in all organisms are composed in part of radioactive carbon-14. which statement best explains the presence of carbon-14 in organisms? a. the radioactive isotope reacts in the same way as stable isotopes in the nuclear reactions in the body. b. the radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body. c. the radioactive isotope reacts faster than stable isotopes in the nuclear reactions in the body. d. the radioactive isotope reacts faster than stable isotopes in the chemical reactions in the body.

The correct answer is option b, that is, the radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.

Explanation:

The carbon-14 atoms, which are created by the cosmic rays associates with oxygen to produce carbon dioxide that plants captivate naturally and comprise it into plant fibers by the process of photosynthesis. Afterward, the plants are consumed by animals and human beings, thus, they take in carbon-14 as well.  

The ratio of usual carbon-12 to carbon-14 in the air and in all the living species at a particular period is almost the same. These radioactive isotopes react in a similar manner as stable isotopes in the chemical reactions in the body.  

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.