Which of the following laws concerning gases is misstated? a. in a mixture of gases, the total pressure of the gases equals the sum of the individual pressures of each gas. b. at fixed temperature and pressure, the volume of a gas is inversely proportional to the number of moles of that gas. c. at fixed pressure, the volume of a gas is directly proportional to its temperature in kelvin. d. at fixed temperature, the volume of a gas is inversely proportional to its pressure. e. the average translational kinetic energy of the molecules of a gas is directly proportional to the temperature in kelvin.