The weight of an object is the force exerted on it due to gravity.

Here's how to calculate it:

* Weight = mass x acceleration due to gravity

* Mass: 1.0 kg

* Acceleration due to gravity (on Earth): approximately 9.8 m/s²

Therefore, the weight of the object is:

1.0 kg x 9.8 m/s² = 9.8 Newtons (N)