[GT.03]A group of scientists have proposed a new theory about biological evolution. The new theory would be reliable if other scientists prove the results non-testable
other scientists repeat and match the results
it is not supported by lengthy data and observation
it is accepted as a universal law of nature

Other scientists repeat and match the result.

Explanation:

A scientific theory can be define as the description for the cause of natural phenomena. This is supported by evidences obtain by experimental process.

A scientific theory is said to be reliable when similar results obtain by the other scientists on application of the same concept or methodology as in theory.

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.