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in Olympiad by (76.5k points)

A black dot has a mass of about one fem to gram. Assuming that the dot is made up of carbon only, calculate the approximate number of carbon atoms present in the dot.

a) 1 × 10

b) 5 × 1010 

c) 5 ×107 

d) 1× 1011

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1 Answer

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by (71.4k points)

Correct option: (c) 5 ×107

Explanation: 

A block dot has mass = 1 femto gram = 10–15 gram

dot is made up of carbon only

So, 12 g carbon contains = NA atoms

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