ENERGETICS

Question 1

Standard enthalpy of formation

Answer 1

heat released or absorbed when one mole of a compound is formed by combination of its elements at standard states ( 100kpa and 298k)

Question 2

standard enthalpy of combustion

Answer 2

enthaloy change when one mole of a substance undergoes complete combustion under standard conditions .

Question 3

standard enthalpy of reaction

Answer 3

enthalpy change when amount of reactants shown in a balanced chemical equation at standard pressure and temperature react to give products at standard temperature and pressure.

Question 4

standard enthalpy of neutralisation

Answer 4

enthalpy change when one mole of water is formed from an acid and alkali react under standard conditions.

Question 5

hess law

Answer 5

hess law states that the enthalpy change in a chemical reaction is independent of the route by which the chemical reaction takes place as long as the initial and final conditions are same.