Neptune has a mass of 1.024 ∙ 1032 milligrams. Use scientific notation to express the planet's mass in kilograms. 1 milligram = 0.0000001 kilograms.

We are required to find the standard unit of the planet's mass in kilogram.

Weight of Neptune = 1.024^10^32 milligrams

The weight in Kg will be given by:

1 milligram=0.0000001 Kg = 1*10^ (-7) kg

Weight of the planet will be:

(1.024) * 10^32 * (1*10^ (-7))

=1.024^25 Kg