Answer:
To calculate the volume of each substance, we need to use the density of the substance and the mass given in the problem. However, Table 1.5 has not been provided, so we don't have the necessary information to perform the calculations.
Regarding the unique property of gases containing mostly empty space, it relates to the fact that gas molecules are widely spread out and have significant gaps between them. This is because gas molecules are in constant motion and move freely within their container. The volume occupied by gas molecules themselves is relatively small compared to the overall volume of the gas. As a result, gases can be compressed and occupy a larger or smaller space depending on the pressure and temperature conditions.
The calculations for the volume of each substance would provide numerical values that represent the occupied space by the respective substances at a given pressure. These volume values would demonstrate that gases, such as hydrogen gas and water vapor, occupy a larger volume compared to solid substances like iron due to the increased empty space between gas molecules.
However, without the necessary data from Table 1.5, specific calculations and comparisons cannot be made in this context.