Considering the following reactions, what type of reaction is represented by these two examples?

#Mg(s) + 1/2 O_2(g) -> MGO(s) + 146# kcal/mol
#H_2(g) + 1/2 O_2(g) -> H_2O(g)# #DeltaH = -57.82# kcal/mol.

1 Answer
anor277
Jul 7, 2016

These are both #"enthalpies of formation"#, #DeltaH_f^@#

Explanation:

The #"enthalpy of formation"# is the enthalpy associated with the formation of one mole of product from its constituent elements under standard conditions.

Note that you have listed enthalpy as a product in the formation of #MgO#; of course you are aware that this represents a NEGATIVE #DeltaH_f^@#. If you ar not clear on why I should mention this, ask for clarification.

Related questions
See all questions in Chemical Reactions and Equations
Impact of this question
1442 views around the world
You can reuse this answer
Creative Commons License