Ideal Gas Law In chemistry, you may learn about the ideal gas law, given by the equation PV = nRT, where n is the number of moles, R is a gas constant, P represents pressure, V measures volume, and T measures temperature in Kelvin. Suppose that, for a particular gas, R = 8.314 J/(mol·K). Suppose that the pressure is increasing at 5 atmospheres per second, while the number of moles is increasing at the rate of 2 moles per second. The temperature is increasing at a rate of 15 degrees Kelvin per second. How fast is the volume changing when the pressure is 125 atm, the volume is 150 L, the number of moles is 85, and the temperature is 300 K?