H. Study the chemical equation below and answer the questions that follow. Na2CO3 (aq) + H2SO4 (aq) → Na2SO4 (aq) + CO2(g) + H20 (1)
What volume of 0.5 mol L sulphuric acid is needed to react with 21.2 g of Na2CO3 (molar mass
of Na2CO, is 105.99)?
i.​

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a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

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.