What is the overall enthalpy of reaction for the equation shown below?

3H2(g)+O3(g)(arrow)3H2O(g)

Explanation:

Given component reaction as this

2H2(g)+O2(g)2H2O. ∆H =-

483.6kj1

3O2(g)2O3(g). ∆H= +284.6kj.---2

Calculating the o eral ethalpy for

3H2(g)+03(g)3H2O(g)3

Equation 3 can be found as this

3(1)-eqn 2/3

-3*483.6-284.6/2=-867.7kj

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

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.