The object's "weight" is (mass) x ( acceleration of gravity).
On Earth, the acceleration of gravity is about 9.8 m/s² .
250 g = 0.25 kilogram .
The strength of the mutual gravitational forces
between the object and the Earth is
(0.25 kg) x (9.8 m/s²) = 2.45 newtons
(about 8.82 ounces)