Which isotope. I will assume you are asking about F19
Well, there are 6.02E23 F2 molecules in 22,400 cc of the gas.
So there will be 6.02E23 F2 molecules x (10 cc/22,400) in 10 cc of the gas = X.
There are 19 nucleons in one atom or 38 nucleons in F2 molecules so 38 time the value you found for X above.
Nucleons in 10 cm³ flourine gas
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