May 04, 2024, 10:10:25 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Mass Balancing in Molecular Formulae  (Read 4745 times)

0 Members and 1 Guest are viewing this topic.

Offline scottydsntknow

  • New Member
  • **
  • Posts: 4
  • Mole Snacks: +0/-0
Mass Balancing in Molecular Formulae
« on: February 13, 2009, 12:33:57 AM »
i dnt really know how to start this problem
any help.

A certain metal,   M   forms two oxides   M3O   and   M2O.
If the percent by mass of   M   in   M3O   is   75.0 %   what is the percent by mass of   M   in   M2O ?



oh and also.

A compound contains 5.93 percent hydrogen and 94.07 percent oxygen. It's experimentally determined mass is 34.02 g/mol. What is the molecular formula of this compound ?
« Last Edit: February 16, 2009, 11:59:16 AM by geodome »
Logged

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7979
  • Mole Snacks: +555/-93
  • Gender: Male
Re: stuck on problem
« Reply #1 on: February 13, 2009, 01:07:29 AM »
According to forum rules you have to show your attempt
Logged
AWK

Offline JGK

  • Chemist
  • Full Member
  • *
  • Posts: 738
  • Mole Snacks: +66/-19
  • Gender: Male
Re: stuck on problem
« Reply #2 on: February 13, 2009, 01:39:39 PM »
The first part is a simple Math exercise, use the information given for M3O and then use that to solve the question regarding M2O.

For the second part, you will need to get the atomic wts of hydrogen and Oxygen in order to calculate the structure.
Logged
Experience is something you don't get until just after you need it.

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re: stuck on problem
« Reply #3 on: February 16, 2009, 11:58:30 AM »
Can you formula some algebra equations from the information given in the question?
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

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7979
  • Mole Snacks: +555/-93
  • Gender: Male
Re: Mass Balancing in Molecular Formulae
« Reply #4 on: February 17, 2009, 03:48:56 AM »
M3O is rather an exotic metal oxide
Quote from: scottydsntknow on February 13, 2009, 12:33:57 AM
i dnt really know how to start this problem
any help.

A certain metal,   M   forms two oxides   M3O   and   M2O.
If the percent by mass of   M   in   M3O   is   75.0 %   what is the percent by mass of   M   in   M2O ?



oh and also.

A compound contains 5.93 percent hydrogen and 94.07 percent oxygen. It's experimentally determined mass is 34.02 g/mol. What is the molecular formula of this compound ?
Logged
AWK

Offline JGK

  • Chemist
  • Full Member
  • *
  • Posts: 738
  • Mole Snacks: +66/-19
  • Gender: Male
Re: stuck on problem
« Reply #5 on: February 17, 2009, 11:14:22 AM »
Quote from: geodome on February 16, 2009, 11:58:30 AM
Can you formula some algebra equations from the information given in the question?

No, it is your homework!. The forum doesn't do your work for you (check the rules).

We will help by pointing the best way/ showing where you have gone wrong, but you have to show us your efforts to start the process,
Logged
Experience is something you don't get until just after you need it.
Pages: [1]   Go Up
« previous next »
Sponsored Links