Which of the following is a difference between a law and a theory? -A theory explains a scientific phenomenon whereas a law describes a natural process.
-A law is based on observations whereas a theory is not.
-A law can change based on new evidence whereas a theory does not.
-A law explains a natural process whereas a theory describes a natural process.

Explanation:

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the primary difference between a scientific theory and a scientific law is that a law explains why some physical phenomenon behave as they do allows scientists to predict how physical phenomenon will behave has been heavily tested through repeated experimentation is a scientific model

the difference between a scientific law and a scientific theory is a law has been proven while a theory has not

a scientific law is differ from 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.

the answer would be b i believe