The following reaction is used in the industrial synthesis of pol...

Question

The following reaction is used in the industrial synthesis of polyvinyl chloride (PVC) polymer:

Cl2(g) + H2C=CH2(g) → ClCH2CH2Cl(l) ∆H = -52kcal/mol (-218 kJ/mol)

Is ∆S positive or negative for this process?

Accepted Answer

Welcome back, everyone is delta S or entropy change positive or negative for the synthesis of liquid ammonia. NH three. Let's recall our facts about entropy. S recall that s represents our symbol for entropy and it describes the degree of chaos and disorder of a system. So if we have a positive change in entropy or positive delta us, this means we have an increase in entropy. Whereas if we have a negative delta S value, we have a decrease in entropy or disorder of our system. Recall that our gas face has the highest amount of entropy versus our liquid face, which has a lower amount of entropy. And our liquid phase has a greater amount of entropy than our solid phase, which has the lowest amount of entropy. So let's see how our phases change from our react inside to our product side. In our given reaction. In our given reaction, we have three moles of hydrogen gas reacting with two moles of nitrogen gas to produce two moles of liquid ammonia were given delta H which is our Anthill be change equal to negative 38.4 kilocalories per mole also equivalent to negative 161 kg joules per mole on our react inside, we can count a total of four moles of gas. Versus on the product side, we just have to molds of liquid. Our four moles of gas from our react inside comes from our three moles of our di atomic hydrogen gas plus our one mole of our di atomic nitrogen gas. And that gives us our four moles of gas on the react inside. As we stated, our gaseous state has higher entropy than our liquid state. And so this means that we went from higher entropy on the reactant side to lower entropy on the product side with just our liquid state being present. And because we went from higher entropy to lower entropy, we would say that therefore, our entropy change is going to be negative. And so delta S is going to be negative as our final answer. And this is going to correspond to choice b in the multiple choice which states that entropy is negative for the synthesis of liquid ammonia. So I hope this made sense and let us know if you have any questions.

The following reaction is used in the industrial synthesis of polyvinyl chloride (PVC) polymer: Cl2(g) + H2C=CH2(g) → ClCH2CH2Cl(l) ∆H = -52kcal/mol (-218 kJ/mol) Is ∆S positive or negative for this process?

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