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Q.

How many moles are present in 36g of He?


 

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a

20 moles

b

6 moles

c

9 moles

d

5 moles

answer is D.

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Detailed Solution

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Solution:

Concept: The number of moles is given as:

Number of moles- Given mass ÷molar mass

The molar mass of helium is 4.

Hence the number of moles in 36g of He is:

36 ÷9 = 4


 


 

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