An object has a mass of 250 g. What is the gravitational force of the object by the earth

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)