Review Questions for Exam 3: 1) If there is unknown quantity of Hydrogen gas at a pressure of 2.1 atm, a volume of 35 liters, and a temperature of 28â, how many moles of gas do I have? What would be the gram of the gas. 2) If 22.5 L of nitrogen at 748 mm Hg are compressed to 725 mm Hg at constant temperature. What is the new volume? 3) A 30.0 liter sample of gas initially at 150'C is allowed to cool at constant pressure, what will the new volume be at -25°C? 4) A gas with a volume of 4.0L at a pressure of 20skPa is allowed to expand to a volume of 12.0L. What is the pressure in the container if the temperature remains constant? 5) What pressure is required to compress 196.0 liters of air at 1.00 atmosphere into a cylinder whose volume is 26.0 liters? 6) A container containing 5.00 L of a gas is collected at 100 K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure 7) 50 g of nitrogen (N2) has a volume of liters at STP. 8) What is the density of carbon dioxide at STP? 9)The pressure of a gas is reduced from 1200.0 mm Hg to 850.0 mm Hg as the volume of its container is increased by moving a piston from 85.0 mL. to 350.0 mL. What would the final temperature be if the original temperature was 90.0 °C.