The process by which a new substance is created from a set of initial substances

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

How far is the region from the equator or control climate