December 19, 2014

Homework Help: Chemistry

Posted by Anonymous on Wednesday, October 14, 2009 at 3:31pm.

I recently performed an experiment in which magnesium oxide formed.
I have to find out the simplest whole number ratio of Mg atoms to O atoms.
How do I go about doing this?

* Chemistry - DrBob222, Tuesday, October 13, 2009 at 11:19pm

Mass MgO - mass Mg initially = mass oxygen added.
%Mg = [mass Mg/mass MgO]*100 = ??
%O = [mass O/mass MgO]*100 = xx

Now ??/atomic mass Mg =
and xx/atomic mass O =
and go from there.

Ok, so:
Mass MgO (0.27g) - Mass Mg initially (0.17g) = 0.1g (Mass oxygen added)
Does that look alright so far?

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