An empty crucible weighs 12.437 2 g and the same crucible containing a precipitate from a gravimetric analysis weighs 12.529 6 g. (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 ± 0.3 mg. Find the absolute and relative uncertainty of the mass of the precipitate and write the mass with a reasonable number of digits.

I know the answer of (a), but need (b) answer.

Movement that is like a t a type of wave that transfers energy where the particles in the medium move in a circle motion while the energy travels left or right. a type of wave that transfers energy where the particles in the medium move perpendicular to the direction in which the energy is traveling. transfers energy from one location to another a type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling. movement that is back and forth, like an equal sign = 1. wave 2. parallel movement 3. perpendicular movement 4. transverse wave 5. longitudinal wave 6. surface wave