Homework Help: Chemistry

Posted by Doris on Sunday, October 10, 2010 at 10:36pm.

A sample of magnesium with a mass of 1.00 g is burned in oxygen to produce an oxide with a mass of 1.66 g. What is the empirical formula of the magnesium oxide produced? I know the answer is MgO. What are the steps to get that answer?

Chemistry - DrBob222, Sunday, October 10, 2010 at 11:52pm
Convert grams to moles.
1.00 g Mg/ 24.3 = moles Mg

g Osygen = 1.66-1.00 = 0.66
moles oxygen = 0.66/16 = moles O.

Now find the ratio of the two in and round to whole numbers. You will find 1:1 ratio.

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