Density Calculations Challenging Examples 1 & 2 - Mass of a Rectangular Prism

Example 1: What is the mass in kilograms of a rectangular 24k gold bar that is 2.00 cm wide, 5.00 cm thick, and 45.72 cm long? Example 2: What is the mass of the air in this room? L = 16.0 m, W = 9.00 m, H = 3.00 m
Using the density equation and the volume equation of a rectangular prism to calculate mass.