After a vehicle collision, 140 g of sodium azide (NaN3) decomposes to form 3.2 moles of nitrogen gas (N2) needed to inflate an airbag. This process is represented by the following balanced chemical
equation.
2 NaN3(s) + 2 Na(s) + 3 N2(g)
Calculate the volume of the nitrogen-filled bag, if the reaction occurs at 298 K and 1.2 atm.

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Explanation:

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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.

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