Standard enthalpy change of formation

Question 1

Standard enthalpy change of formation meaning

Answer 1

The enthalpy change when one mole of a compound is formed from elements under standard conditions

Question 2

Standard enthalpy change of formation symbol

Answer 2

ΔHꝊ f

Question 3

Does Standard enthalpy change of formation occur in exothermic or endothermic reactions or both

Answer 3

both

Question 4

The ΔHfꝊ of an element in its standard state is

Answer 4

The ΔHfꝊ of an element in its standard state is zero.

For example, ΔHfꝊ of O2(g) is 0 kJ mol-1