April 25, 2024, 06:41:34 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Chemical calculation  (Read 6402 times)

0 Members and 1 Guest are viewing this topic.

yeung

  • Guest
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?
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27663
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
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!
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

yeung

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

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re:Chemical calculation
« Reply #3 on: August 27, 2005, 11:43:20 PM »
16.5moles of HCl
Logged
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

yeung

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

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27663
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
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 »
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27663
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
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 »
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline sdekivit

  • Chemist
  • Full Member
  • *
  • Posts: 403
  • Mole Snacks: +32/-3
  • Gender: Male
  • B.Sc Biomedical Sciences, Utrecht University
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.
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links