Define the standard enthalpy of formation
The standard enthalpy of formation of a substance is the enthalpy change when one mole of that substance is formed from the most stable allotropes of its elements in their standard states under standard conditions.
AG
Related Chemistry A Level answers
All answers ▸State 2 features of a system that is in dynamic equilibrium.
How do amino acids change at different pH?
Using chemical reagents in test tubes, distinguish between isomers: A CH3CO(CH2)2CHOH, B CH3CH(OH)(CH2)2CHO and C C(CH3)2OHCOCH3
Calculating the charge of a molecule e.g In NH4 what is the charge of the nitrogen atom?