4.8.5B The diagram shows a model of an atom. The model has 4 different 10 points
symbols on it. Each symbol represents a different role for one of the
particles within the atom. In this model, which particle determines the
reactivity of this atom?
Model Atom
Z
z
Z
Ow

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.

i think it's c. i'm not sure but i think so.

just did the assignment and the answer was #1 +2 n