Using hess's law, what is îhâ°rxn for the following reaction? no(g) + o(g) â no2(g)no(g) + o3(g) â no2(g) + o2(g) îhâ°rxn = â198.8 kj/molo3(g) â 3/2 o2(g) îhâ°rxn= â142.2 kj/molo2(g) â 2o(g) îhâ°rxn= +498.8 kj/mol

The enthalpy of the reaction asked is -306 kJ/mol.

Explanation:

..[1]

..[2]

..[3]

..[4]

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

[1] - [2]  - [3] × 0.5 = [4]

(By using Hess's law)

The enthalpy of the reaction asked is -306 kJ/mol.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.