the diagram represents waves a, b, c, and d traveling in the same medium. which two waves shown have the same wavelength

In which of these cases are the two wave points considered to be in phase with each other?

What is the mass of each element in a 324.8 sample of co2

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?