25.  (WCSU25.[x]) Hot air is less dense than cold air and th…

25.  (WCSU25.) Hot air is less dense than cold air and this is the reason that hot air balloons float! A hot air balloon on a cool summer morning is filled with air to a volume of 2.80 x 106 L and warmed to 195 °F (90 °C).  A hot air balloon must be inflated to a volume of approximately 3.10 x 106  L in order to float in air. a. (4 points) At constant pressure, provide a molecular-level explanation of the relationship between temperature and volume of a gas.   b.  (6 points) Calculate the temperature the gas must be (in °C) in order to float.   Enter the temperature of the gas below.