Volume of a Gas Natural gas provides 25% of U.S. energy. The volume of a gas varies inversely with the pres- sure and directly with the temperature. (Temperature must pe measured in kelvins (K), a unit of measurement used in -hysics.) If a certain gas occupies a volume of 1.3 liters at 00 K and a pressure of 18 newtons per square centimeter, nd the volume at 340 K and a pressure of 24 newtons per quare centimeter.

You have a gas, one of the three known phosphorus-fluorine compounds (PF3, PF3, and P2F4). To find out which, you have decided to measure its molar mass. (a) First, yon determine that the density of the gas is 5.60 g/L at a pressure of 0.971 atm and a temperature of 18.2 C. Calculate the molar mass and identify the compound. (b) To check the results from part (a), you decide to measure the molar mass based on the relative rales of effusion of the unknown gas and CO2. You find that CO2 effuses at a rate of 0.050 mol/min, whereas the unknown phosphorus fluoride effuses at a rate of 0.028 mol/min. Calculate the molar mass of the unknown gas based on these results.

Consider these four gas samples, all at the same temperature. The larger boxes have twice the volume of the smaller boxes. Rank the gas samples with respect to: (a) pressure, (b) density, (c) average kinetic energy, and (d) average molecular speed. (Green spheres are He; violet spheres are Ne.)

An alternate way to state Avogadro’s law is A1l other things being equal, the number of molecules in a gas is directly proportional to the volume of the gas. (a) What is the meaning of the term directly proportional? (b) What are the other things that must be equal