$$Mass = Weight / Gravitational acceleration$$

$$Mass = 300 N / 9.8 m/s^2$$

$$Mass ≈ 30.61 kg$$

So your mass is approximately 30.61 kilograms.

Now, to calculate your weight on Mars, we need to know the gravitational acceleration on Mars. The gravitational acceleration on Mars is approximately 3.711 m/s^2. Using the formula:

$$Weight on Mars = Mass * Gravitational acceleration of Mars$$

$$Weight on Mars = 30.61 kg * 3.711 m/s^2$$

$$Weight on Mars ≈ 113 N$$

Therefore, your weight on Mars would be approximately 113 Newtons.