How much heat is produced in buring a mole of CH_(4) under standard conditions if reactants and products are brought to 298 K and H_(2)O(l) is formed ? What is the maximum amount of useful work thatcan be accomplished under standard conditions by this system ? CH_(4)(g)+2O_(2)(g) to CO_(2)(g)+2H_(2)O(l) {:(DeltaHf^(0):-74.8,0,-393.5,-285.85kJ),(DeltaGf^(0):-50.8,0,-394.4,-236.8kJ):}

How much heat is produced in buring a mole of CH_(4) under standard co

1.	How much heat is produced in buring a mole of CH_(4) under standard conditions if reactants and products are brought to 298 K and H_(2)O(l) is formed ? What is the maximum amount of useful work thatcan be accomplished under standard conditions by this system ? CH_(4)(g)+2O_(2)(g) to CO_(2)(g)+2H_(2)O(l) {:(DeltaHf^(0):-74.8,0,-393.5,-285.85kJ),(DeltaGf^(0):-50.8,0,-394.4,-236.8kJ):}
Answer» Solution :`DeltaH^(@)=(-393.5)+(2xx-285.85)-(-74.8)-2xx0` `=-890.4kJ`/MOLE Now the free ENERGY CHANGE for a process `DeltaG` equals the maximum useful work that can be done by the system at constant TEMPERATURE and pressure. `:. W_(max)=DeltaG=(2xx-236.8)+(-394.4)-(50.8)-2xx0` `=-817.2kJ`/mole `CH_(4)`.