You cannot equate the two units.
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You cannot. The first is the measure of volume, the second of mass. A cubic metre of air would have a much smaller mass (fewer kilograms) than a cubic metre of lead.
The only way to solve this is to identify the substance being measured. For example, exactly one cubic meter of pure water at sea level, at a temperature of 3.98 °C (its densest) masses exactly 1,000 kilograms, or one metric tonne. (In fact, this is the very definition of a metric tonne.)
mass = volume x density. The units, of course, have to be compatible - for example, if the volume is in cubic meters, and the density in kilograms per cubic meter, the mass will naturally be in kilograms.
To convert cubic meters (m^3) to kilograms (kg), you need to know the density of the substance in question. The formula for this conversion is: mass (kg) = volume (m^3) x density (kg/m^3). So, if you have the density of the substance, you can multiply the volume in cubic meters by the density to get the mass in kilograms.
Due to the fact that the Kilogram and the Meter measure two entirely different concepts, this question can not be answered. The meter measures a factor of only a single dimension, whereas the kilogram measures three (or probably more) dimensions. You can, for example, ask how many Kilograms are there in 300 cubic meters of x, due to the fact that cubic meters run in three dimensions.