Which of the following sentences BEST describes the balanced reaction below? 2Na + Cl2 > 2NaCl

A. two sodium atoms react to form a chlorine gas molecule and two sodium chlorides

B. two sodium Atoms and chloride gas react to form to sodium chloride compounds

C. two molecules of sodium reacts with one chlorine molecule to make two molecules of sodium chloride

D. to sodium plus two chlorine produces sodium chloride

it should be p1 v1 = p2 v2

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.