Using the Ideal Gas Law Methane, CH4, is being considered for use as an alternative automotive fuel to replace gasoline. One gallon of gasoline could be replaced by 655 g of CH4. What is the volume of this much methane at 25 "C and 745 torr? Check Your Learning Calculate the pressure in bar of 2520 moles of hydrogen gas stored at 27 .C in the 180-L storage tank of a modern hydrogen-powered car.EXAMPLE 9.10 Using the Combined Gas Law When filled with air, a typical scuba tank with a volume of 13.2 L has a pressure of 153 atm (Figure 9.16). If the water temperature is 27 *C, how many liters of air will such a tank provide to a diver's lungs at a depth of approximately 70 feet in the ocean where the pressure is 3.13 atm? Figure 9.16 Scuba divers use compressed air to breathe while underwater. (credit: modification of work by Mark Goodchild) Check Your LearningCheck Your Learning A sample of ammonia is found to occupy 0.250 L under laboratory conditions of 27 *C and 0.850 atm. Find the volume of this sample at 0 *C and 1.00 atm