Homework Help: Chemistry

Posted by ben on Saturday, September 3, 2011 at 4:39pm.

Thank you very much for your assistance preemptively. My question has to do with law of conservation of mass.

A 50g sample of iron reacts with 21g of oxygen to from how many grams of iron oxide? Is the answer maybe 71g or 29g. This is stumping me.

Chemistry - DrBob222, Saturday, September 3, 2011 at 7:36pm
Yes, mass on left = mass on right

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