Burning one mole of propane according to the following reaction liberates 526 kcal of energy. If all of the coefficients are tripled, how much energy will be released? C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(I)

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?