An empty crucible weighs 12.437 2g and the same crucible containing a precipitate from a gravimetric analysis weighs 12.529 6g.

(a) Each mass has six significant digits. What is the mass of precipitate contained in the crucible and how many significant digits are in that mass?
(b) The manufacturer states that the balance has an uncertainty of 60.3 mg. Find the absolute and relative uncertainty of the mass of the precipitate and write the mass with a reasonable number of digits.