A student is creating a scale model of our solar system. In order to make her model accurate, she finds the diameter of the Earth and its moon. The diameter of the Earth is about 13,000 km. The diameter of the moon is about 3,500 km. If she makes the Earth 26 cm, will the moon be bigger or smaller than 26 cm? Why?

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.