A weather balloon is inflated to a volume of 26.1 L, at a pressure of 753mmHg and a temperature of 30.9C. The balloon rises in the atmosphere to an altitude where the pressure is 390.mmHg and the temperature is 15.7.C. Assuming the balloon can freely expand, calculate the volume of the balioon at this altude. What is the pressure in a 22.0-L cylinder filled with 48.0g of oxygen gas at a temperature of 341F Express your answer to three significant figures with the appropriate units. Use the molar volume of a gas at STP to calculate the density (in g/L ) of oxygen gas at STP. Express the density In grams per liter to three significant figures. What is the density (in g/L ) of hydrogen gas at 19C and a pressure of 1665psi ? Express your answer in grams per liter to three significant figures