a) calculate the number of atoms in 52 unit of helium
b)calculate the mass of 1 atom of carbon 14
c) In 3 moles of ethane , calculate number of moles of carbon

Asked by ppratim02 | 29th Apr, 2015, 09:32: PM

Expert Answer:

Dear ppratim02@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.

In case of multiple questions within a query, please post each question individually and let us know where you are getting stuck so that we would be able to explain things better.
Solution for your first query,
4 units of He corresponds to 1 mole He
Hence, 52 units of He corresponds to 13 moles of He
Now, 1 mole He contains 6.023 x 1023 atoms
Hence 13 moles He contains 13 x 6.023 x 1023 atoms
= 78.3 x 1023 atoms

Topperlearning Team.

Answered by Prachi Sawant | 2nd May, 2015, 05:12: PM