Use the standard reaction enthalpies given below to determine ΔH° rxn for the following reaction P 4(g) + 10 Cl 2(g) → 4PCl 5(s) ΔH° rxn = ? Given: PCl 5(s) → PCl 3(g) + Cl 2(g) ΔH° rxn = +157 kJ P 4(g) + 6 Cl 2(g) → 4 PCl 3(g) ΔH° rxn = -1207 kJa) -1835 kJb) -1364 kJc) -1050. kJd) -1786 kJe) -2100. kJ

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.