I've amaged 9 questions of a worksheet but I cannot manage 2.
1.Describe one example of the use of radionuclides in investigating the mechanism of a reaction, and one of a use in industry.
For industry I would say regulating sheet thickness of aluminium foil. I'm finding it difficult to understand the first question.
2. The ratioof tritium 3H to hydrogen 1H is 1:1x10^19. If the half-life of tritium is 12.25 years, calculate the actual number of tritium atoms remaining in 10g of water after a period of 49 years.
I'm lost in the part of changing grams into atoms for some reason. The answer has to result to 4182 atoms (he gave us the answers but I cannot get to it).
Thank you in Advance