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Q.


Volume occupied by one molecule of water (density Question Image ) is:


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a

Question Image

b

Question Image

c

Question Image

d

Question Image 

answer is A.

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Detailed Solution

Concept- 1 mole of molecules has the same mass as the gram molecular mass of the substance. 1 mole =
Question Image number of particles.
We know that the gram molecular mass of water or Question Image is 18 grams. This contains 1 mole of molecules, that is, Question Image molecules.
Therefore, the mass of Question Image molecules of water are 18 grams.
Therefore, mass of 1 molecule of water in grams will be
Question ImageNow, the given density of water is Question Image.
Now, we know that Volume Question ImageTherefore, volume of one molecule of water will be
Question ImageQuestion ImageQuestion ImageTherefore the volume of one molecule of water is Question Image.
The closest option to this value is the correct option A) Question ImageQuestion Image is called the Avogadro's number (NA). One mole of any substance, be it molecules or any other
Avogadro number of particles are contained in particles. All chemical elements and compounds have an Avogadro number of molecules (or atoms) with the mass of their gramme molecular weight.
Students must exercise extreme caution when answering queries involving the Avogadro value. Many times, incorrectly writing the number results in absurd mistakes. For example, a common blunder is writing the Avogadro number as
Question Image instead Question ImageThis can result in a very different and ludicrous response.
Hence, the correct answer is option 1.
 
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