A sample of argon gas has a volume of 735 mL at a pressure of 1.20 atm and a temperature of 112 degrees C. What is the volume of gas, in milliliters, when the pressure and temerature of the gas sample are changed to each of the following? a) 658 mmHg and 281 K. b) 0.55 atm and 75 degrees C. c) 15.4 atm and -15 degrees C.