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Q.

How many moles are present in 40 g of He?


 

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a

20 moles

b

10 moles

c

6 moles

d

50 moles

answer is D.

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Detailed Solution

Solution:

Concept: The number of moles is given as:

Question Image

The molar mass of helium is 4.

Hence the number of moles in 40 g of He is:

Question Image


 

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