9) after lab, all of darrel’s friends looked at his data and laughed and laughed. they told him that he was 30.8% too low in the boiling point he had just recorded. he had recorded a boiling point of 50o c on his data sheet. what is the correct boiling point of the liquid he was working with in lab?

Explanation:

Data:

Percent error = 30.8 %

    Measured = 50 °C

Calculation:

Let x = the actual value

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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