EXAMPLE 9.7 Measuring Temperature with a Volume Change Temperature is sometimes measured with a gas thermometer by observing the change in the volume of the gas as the temperature changes at constant pressure. The hydrogen in a particular hydrogen gas thermometer has a volume of 150.0 cm when immersed in a mixture of ice and water (0.00 C). When immersed in boiling liquid ammonia, the volume of the hydrogen, at the same pressure, is 131.7 cm. Find the temperature of boiling ammonia on the kelvin and Celsius scales. Check Your Learning What is the volume of a sample of ethane at 467 K and 1.1 atm if it occupies 405 mL at 298 K and 1.1 atm? volume of a Gas Sample The sample of gas in Figure 9.13 has a volume of 15.0 mL at a pressure of 13.0 psi. Determine the pressure of the gas at a volume of 7.5 mL, using: (a) the P-V graph in Figure 9.13 (b) the vs. V graph in Figure 9.13 (c) the Boyle's law equation Comment on the likely accuracy of each method. Check Your Learning The sample of gas in Figure 9.13 has a volume of 30.0 mL at a pressure of 6.5 psi. Determine the volume of the gas at a pressure of 11.0 psi, using: (a) the P-V graph in Figure 9.13 (b) the vs. V graph in Figure 9.13 (c) the Boyle's law equation