the density of air at room temperature is 1.3 g/L at 0⁰C. what is the mass at the air in pounds in a room 4.0 m long, 3.0 m wide, and 2.5 m high?​

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car