The graph shows a sample of gas when it is hot, cold, and at room temperature.
Which statement is correct about curves B and C?

A. B represents hot gas and C represents gas at room temperature.

B. B represents gas at room temperature and C represents hot gas.

C. B represents gas at room temperature and C represents cold gas.

D. B represents cold gas and C represents gas at room temperature.

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 the answer is terrae but not 100 percent sure. ▓▬▬ §