2 Na (s) + Cl2 (g) → 2 NaCl is the balanced reaction for the formation of table salt.
Given 20 grams of Na (s) and 10 grams of Cl2, which reactant is in excess? And, how much NaCl should be produced from these amounts of the two reactants?
a. Na; 16.82 g
b. Cl2; 0.29 g
c. Cl2; 0.87 g
d. Na; 15.47 g

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.

2b2t

explanation:

2b2t