An initially deflated and flat balloon is connected by a valve to a storage tank containing helium gas at 1 mpa at ambient temperature of 20 degrees c. the valve is open and the balloon is inflated at constant pressure of 100 kpa (atmospheric pressure) until it becomes spherical at d1 = 1m. if the balloon is larger than this, the balloon material is stretched giving a pressure inside as:

p = po + c(1-(d1//d)

the balloon is slowly inflated to a final diameter of 4m, at which point the pressure inside is 400 kpa. the temperature remains constant at 20 degrees c. determine the work done during the overall process.

3 hours because it is a decent distance.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.