You can't. You'd need to know density and height of rod.
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You cannot, there is no single-rule, formulaic relationship between mass and physical measurements like length or diameter.
A rod....5 1/2 feet
Not in the theoretical world, in the practical world: just a very little. The period is determined primarily by the length of the pendulum. If the rod is not a very small fraction of the mass of the bob then the mass center of the rod will have to be taken into account when calculating the "length" of the pendulum.
If the rod has a radius of R and a length of L, then total area = 2*pi*R*(R+L) square units.
No specific clarity about rod