When liquid hydrogen peroxide is mixed with liquid hydrazine a very fast exothermic reaction takes place which can propel a rocket. the reaction products are nitrogen and steam. (a) suggest why the reaction needs to be fast
(b) If the rocket is loaded with 680 kg of hydrogen peroxide, calculate the mass of hydrazine which will be needed to react with.

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explanation:

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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.