Answer:
3.26mole
Step-by-step explanation:
Given parameters:
Mass of fluorine = 62g
Unknown:
Number of moles in one tube = ?
Solution:
A mole is the amount of substance that contains the avogadro's number of particles.
We can find the number of moles of a substance by;
Number of moles =

Molar mass of Fluorine = 19g/mol
Substitute in the equation:
Number of moles =
= 3.26mole