Homework Help: chemistry

Posted by nelia on Wednesday, December 5, 2012 at 10:03am.

upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?,

please show the steps I'm really confused with this one.
Thank you

chemistry - DrBob222, Wednesday, December 5, 2012 at 11:03pm
I answered this far above.

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