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How many moles are present in 36g of He?

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20 moles

6 moles

9 moles

5 moles

answer is D.

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Detailed Solution

Solution:

Concept: The number of moles is given as:

Number of moles- Given mass $\div$ molar mass

The molar mass of helium is 4.

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

36 $\div$ 9 = 4

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