Question 18
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how do the boiling point and freezing point of a solution of water and calcium chloride at standard pressure compare to the boiling point and freezing point of water at
standard pressure?
both the freezing point and boiling point of the solution are higher
2
both the freezing point and boiling point of the solution are lower
the freezing point of the solution is higher and the boiling point of the solution is lower
the freezing point of the solution is lower and the boiling point of the solution is higher
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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.

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

the answer is b & c i believe : )