How many kilograms are in a meter squared?

Answer 1

Zero.

Square meters are a measure of area, not volume. As a result, a square meter has no mass.

If however you mean cubic meters, then the question can not be answered without further information. Mass is not dependent solely on volume. A cubic meter of gold will weigh more than a cubic meter of aluminum. If you know the mass per unit of volume of the material in question, then you can answer the question.

Answer 2

Kilograms are a measurement of mass, while a meter squared is a measurement of area. The two units measure different physical quantities and cannot be directly converted into one another. Thus, there is no direct conversion between kilograms and meters squared.