Calculate the volume (in liters) occupied by 1.51 moles of nitric oxide (NO) at 7.50 atm and 57 degrees C 16. What is the volume (in liters) occupied by 43.7 g of HCl at STP? Assume ideal behavior. 18. A sample of oxygen gas initially at 0.650 atm is cooled from 24 degrees C to -75 degrees C at constant volume. What is its final pressure (in atm)? 20. What is the density (in g/L) of uranium hexafluoride (UF6) at 760 mmHg and 58 degrees C?