# Please i need a fast help

1. Oct 12, 2008

### ASMA HASSAN

1. The problem statement, all variables and given/known data[/b]
on this compound ( CH3COOC2H5)
what is the
1) atom ratio of C to O ?
2) mole ratio of the same

Last edited by a moderator: Oct 12, 2008
2. Oct 12, 2008

### Staff: Mentor

How many carbon atoms? How many oxygen atoms?

3. Oct 12, 2008

### ASMA HASSAN

can i add you on my email..
to help me easier?

4. Oct 12, 2008

### Staff: Mentor

Borek provided the method for part 1.

How are atoms and moles related?

Last edited: Oct 12, 2008
5. Oct 12, 2008

### ASMA HASSAN

6. Oct 12, 2008

### Staff: Mentor

7. Oct 12, 2008

### ASMA HASSAN

i need them fast .. so, can you concentrate with me??

8. Oct 12, 2008

### Jonathan Scott

Chemistry is not my subject, but I thought a "mole ratio" was simply the numerical ratio of the number of moles of molecules needed to make a balanced reaction, or in certain cases where the substance doesn't come in molecules, it's in terms of the basic unit, atom or ionic formula. (It can then be multiplied by the molecular or unit weight to determine appropriate ratios of masses of reactants). For example, if the reactants are hydrogen and oxygen gases (H2 and O2) forming water (H2O) then the mole ratio of hydrogen to oxygen is 2:1, the same as the atom ratio, but if one is reacting solid carbon (where the unit is C) with oxygen gas (O2) to make carbon dioxide (CO2) then the mole ratio is 1:1 but the atom ratio is 1:2. Can a chemist confirm that this is correct?

Since O is not a molecule, and for that matter neither is C the "mole ratio" part of this question doesn't make much sense to me, and appears to require an additional assumption. I would personally state my assumption and answer the question on that basis.

9. Oct 12, 2008

### Staff: Mentor

When explaining moles I like to refer to the mole as "overgrown dozen" - just like dozen is 12 objects, mole is 6.02*1023 objects. You may have dozen atoms, dozen molecules, you may have mole of atoms, mole of atoms. Generally speaking you may have mole of cars (not that it makes any sense, but technically that's correct).

See above - mole doesn't have to refer specifically to chemically sound molecules (although it usually does). In this case it just refers to the ratio of numbers of atoms.

10. Oct 12, 2008

### Redbelly98

Staff Emeritus
If you need it fast, then get to work using what you have been told already.

To solve this question you need to answer Borek's question from post #2: how many C atoms and how many O atoms are in the molecule CH3COOC2H5 ? Spending time on anything else (like asking for the email address of anybody who will talk to you) is not a good use of your time.