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CBSE Class 11-science Answered

<div><span style="color: #ff9900;"><span style="color: #000000;">a) </span></span>calculate the number of atoms in 52 unit of helium</div> <div>b)calculate the mass of 1 atom of carbon 14</div> <div>c) In 3 moles of ethane , calculate number of moles of carbon</div> <div>&nbsp; PLEASE EXPLAIN BRIEFLY</div> <div>&nbsp;</div>
Asked by ppratim02 | 29 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
 
 
 
Regards

Topperlearning Team.
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