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Topic: Chemical calculation  (Read 6789 times)

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yeung

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Chemical calculation
« on: August 27, 2005, 06:05:49 AM »
The problem is as follows:

Suppose that all the chlorine in PVC is converted to hydrogen chloride upon incineration.  Calculate the volume of hydrogen chloride produced, measured at room temperature and pressure, when a plastic waste containing 1000 kg of PVC is incinerated.
(You may assume that no other chlorine-containing compounds are present in the waste.)


When I looked at the problem,I was confused.How can we determine the number of moles of PVC involved?We do not know the number of repeating units involved, isn't it?
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Offline Borek

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Re:Chemical calculation
« Reply #1 on: August 27, 2005, 07:05:02 AM »
Quote from: yeung on August 27, 2005, 06:05:49 AM
When I looked at the problem,I was confused.How can we determine the number of moles of PVC involved?We do not know the number of repeating units involved, isn't it?

Number of units will cancel out if you try to write down expression for the mass percentage of HCl in the PVC. Thus it doesn't matter.

Note that you don't have to know number of moles to solve the question!
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yeung

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Re:Chemical calculation
« Reply #2 on: August 27, 2005, 11:05:34 PM »
So,what's the answer?
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Offline Donaldson Tan

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Re:Chemical calculation
« Reply #3 on: August 27, 2005, 11:43:20 PM »
16.5moles of HCl
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yeung

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Re:Chemical calculation
« Reply #4 on: August 28, 2005, 05:52:47 AM »
A detailed explanation?
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Offline Borek

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Re:Chemical calculation
« Reply #5 on: August 28, 2005, 07:39:50 AM »
Quote from: yeung on August 27, 2005, 11:05:34 PM
So,what's the answer?

Aren't you supposed to try by yourself?
« Last Edit: August 28, 2005, 07:50:33 AM by Borek »
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Offline Borek

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Re:Chemical calculation
« Reply #6 on: August 28, 2005, 07:40:46 AM »
Quote from: geodome on August 27, 2005, 11:43:20 PM
16.5moles of HCl

Huh? We are talking kmoles here, Geo!
« Last Edit: August 28, 2005, 07:51:53 AM by Borek »
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Offline sdekivit

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Re:Chemical calculation
« Reply #7 on: August 28, 2005, 10:52:21 AM »
Quote from: Borek on August 28, 2005, 07:40:46 AM
Huh? We are talking kmoles here, Geo!

yes --> 16,5 kmol!

u can use the percent composition of Cl in PVC or use the molar mass of a PVC monomer unit (C2H3Cl)n.
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