If element X (hypothetical) requires 58 years for 100g to decay to 12.5g, what is the half life for element X?

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

Define the kinetic molecular theory