at a festival spherical balloons with a radius of 310. cm are to be inflated with hot air and released. the air at the festival will have a temperature of 25 degrees c and must be heated to 100 degrees c to make the balloons float. 3.00 kg of propane (c3h8) fuel are available to be burned to heat the air. calculate the maximum number of balloons that can be inflated with hot air