November 12, 2024, 01:08:47 AM
Forum Rules: Read This Before Posting


Topic: Relative atomic mass  (Read 2067 times)

0 Members and 1 Guest are viewing this topic.

Offline Bird of paradise

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-1
Relative atomic mass
« on: September 11, 2023, 09:50:27 PM »
A compound has a formula M3N where M is a metal element and N is nitrogen. It contains 0.673 grams of N per gram of the metal M. Determine the relative atomic mass of M and its identity?

Offline Hunter2

  • Sr. Member
  • *****
  • Posts: 2289
  • Mole Snacks: +189/-50
  • Gender: Male
  • Vena Lausa moris pax drux bis totis
Re: Relative atomic mass
« Reply #1 on: September 12, 2023, 01:18:13 AM »
Show your own atempt first.

Offline Hunter2

  • Sr. Member
  • *****
  • Posts: 2289
  • Mole Snacks: +189/-50
  • Gender: Male
  • Vena Lausa moris pax drux bis totis
Re: Relative atomic mass
« Reply #2 on: September 12, 2023, 06:16:02 AM »
Calculate the moles of nitrogen N first.
How many moles of Metal correspond to it?
Backward you can calculate the molar weight from this number and the given mass.

Offline ProfOxidizer

  • New Member
  • **
  • Posts: 4
  • Mole Snacks: +0/-1
Re: Relative atomic mass
« Reply #3 on: September 18, 2023, 08:58:58 AM »
The metal M is lithium with atomic mass equal to 6.94 u.

Offline Hunter2

  • Sr. Member
  • *****
  • Posts: 2289
  • Mole Snacks: +189/-50
  • Gender: Male
  • Vena Lausa moris pax drux bis totis
Re: Relative atomic mass
« Reply #4 on: September 18, 2023, 12:03:55 PM »
Please dont give a final answer.

Offline ProfOxidizer

  • New Member
  • **
  • Posts: 4
  • Mole Snacks: +0/-1
Re: Relative atomic mass
« Reply #5 on: September 18, 2023, 01:06:03 PM »
Please dont give a final answer.

Ok, sorry. It was inappropriate.

Offline gavindor

  • Regular Member
  • ***
  • Posts: 76
  • Mole Snacks: +0/-0
Re: Relative atomic mass
« Reply #6 on: October 10, 2023, 07:33:18 PM »
well technically he didn't give a final answer 'cos the question asked for "relative atomic mass", and he gave atomic mass!

There might be a difference between relative atomic mass and atomic mass, e.g. that one has a unit and the other doesn't!

Offline Hunter2

  • Sr. Member
  • *****
  • Posts: 2289
  • Mole Snacks: +189/-50
  • Gender: Male
  • Vena Lausa moris pax drux bis totis
Re: Relative atomic mass
« Reply #7 on: October 11, 2023, 12:32:08 AM »
He gave the number, doesnt matter in u or g/ mol.

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27840
  • Mole Snacks: +1811/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Relative atomic mass
« Reply #8 on: October 11, 2023, 02:57:07 AM »
He gave the number, doesnt matter in u or g/ mol.

Just to remind you that Mars Climate Orbiter crashed because while numbers were right, units were wrong.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Sponsored Links