Question

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Answer 1

Answer:

Hello

Explanation:

I know only few in the above

Answer 2

Answer:

At STP, 1 mole gas occupies 22.4 litre volume.

So, 56 cm

3

gas have

22.4×1000

56

moles

Number of moles of dry Nitrogen at STP =2.5 milimoles

Number of molecules of dry Nitrogen =2.5×10

−3

×N

A

N

A

= Avogardo Number =6×10

23

So, Nitrogen have 15×1

20

molecules or 1.5×10

21

molecules