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Topic: Mass Balancing in Molecular Formulae  (Read 4911 times)

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Offline scottydsntknow

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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 »
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Offline AWK

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Re: stuck on problem
« Reply #1 on: February 13, 2009, 01:07:29 AM »
According to forum rules you have to show your attempt
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Offline JGK

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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.
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Offline Donaldson Tan

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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?
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Offline AWK

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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 ?
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Offline JGK

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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,
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