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Q.

Calculate the mass of 1 molecule of chlorine and choose the correct option.


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a

1.179 g

b

1.179× 10 −22  g

c

20 g

d

11.79 g  

answer is B.

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Detailed Solution

Concept: The atomic number of chlorine, a halogen, is 17. Chlorine is a naturally occurring diatomic chemical.
We are aware that chlorine has an atomic mass of 35.5 g/mol.
We are also aware that the molecule of chlorine is diatomic. Its molecular mass is therefore twice as great as its atomic mass.
The molar mass of 1 molecule of chlorine Question Image =71 g/mol
Mass of chlorine molecule is:
= Molar mass Avogadro number 71 6.02× 10 23 g =1.179× 10 −22 g
Hence, the mass of 1 molecule of chlorine is 1.179× 10 −22  g .
Hence, the correct answer is option 2.
 
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