October 15, 2019, 07:26:37 AM
Forum Rules: Read This Before Posting


Topic: Problem of the week - 20/05/2013  (Read 16038 times)

0 Members and 1 Guest are viewing this topic.

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 25236
  • Mole Snacks: +1657/-398
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Problem of the week - 20/05/2013
« on: May 20, 2013, 02:03:14 PM »
When a sample of a rose red, rare mineral is reacted with 115.8 mL of 0.1 molar HCl, number of mLs of produced carbon dioxide (measured at 0°C and 1 atm) is identical to the molar mass of produced chloride. Identify the metal, name the mineral.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline Schrödinger

  • Chemist
  • Sr. Member
  • *
  • Posts: 1161
  • Mole Snacks: +138/-98
  • Gender: Male
Re: Problem of the week - 20/05/2013
« Reply #1 on: May 23, 2013, 06:18:23 AM »
Pbonyg ; Fcunrebpbonygvgr
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

Offline delta609

  • Regular Member
  • ***
  • Posts: 22
  • Mole Snacks: +3/-1
Re: Problem of the week - 20/05/2013
« Reply #2 on: May 26, 2013, 01:44:02 PM »
I think it's Rhodocrosite (MnCO3), but the calculations don't add up. 

MnCO3 + 2HCl  :rarrow: MnCl2 + CO2 + H2O

115.8 L of 0.1 molar HCl will produce .1289 mL CO2; whereas, the molar mass of MnCl2 is 125.9 g/mol. 

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 25236
  • Mole Snacks: +1657/-398
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Problem of the week - 20/05/2013
« Reply #3 on: May 26, 2013, 02:24:29 PM »
Calculations don't add up, because it is not the correct answer. But you are not that far.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline DrCMS

  • Chemist
  • Sr. Member
  • *
  • Posts: 1241
  • Mole Snacks: +205/-81
  • Gender: Male
Re: Problem of the week - 20/05/2013
« Reply #4 on: May 26, 2013, 02:55:28 PM »
Sphaerocobaltite?

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 25236
  • Mole Snacks: +1657/-398
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Problem of the week - 20/05/2013
« Reply #5 on: May 26, 2013, 03:58:33 PM »
Sphaerocobaltite?

Yes. But Schrödinger was first :)
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline DrCMS

  • Chemist
  • Sr. Member
  • *
  • Posts: 1241
  • Mole Snacks: +205/-81
  • Gender: Male
Re: Problem of the week - 20/05/2013
« Reply #6 on: May 27, 2013, 03:05:59 AM »
Yes. But Schrödinger was first :)

Yes I see now with rot13

Sponsored Links