If 30 kg is mass on earth how much is mass on the moon

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The same. 30kg of mass is 30kg of mass period.

It still has 30 kg of mass and inertia on the Moon. It just weighs less on the Moon because the Moon has less mass, so the Moon's acceleration of gravity is approximate 1/6 of Earth's acceleration gravity.

The 'mass' is the same anywhere.
The 'weight' on the moon would be about 5 kg.