Which compound does h2so4 represent when in an aqueous solution?
a) sulfur oxide
b) sulfuric acid
c) hydrogen sulfide
d) hydrogen disulfate

The correct answer is option b.

Explanation:

Acid a are those compound which gives hydronium ions in their aqueous solution.

Sulfuric acid in its aqueous solution gives  sulfate ions and hydronium ions.

Hence, the correct answer is option b.

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 have no clue hope you find the answer