Homework Help: chemistry

Posted by Kristen on Monday, July 5, 2010 at 10:31pm.

When magnesium is heated in air, it reacts with oxygen to form magnesium oxide.
2Mg + O2 --> 2MgO
If the mass of the magnesium increases by 0.335 g, how many grams of magnesium reacted?
A. 0.882
B. 0.441
C. 0.509
D. 1.02
E. Not enough Info

chemistry - DrBob222, Monday, July 5, 2010 at 10:42pm
The added mass of 0.335 g must be due to the added oxygen. I would convert 0.335 g O2 to moles, use the coefficients in the balanced equation to convert to moles Mg and multiply by moles mass to convert to grams Mg. Post your work if you get stuck.
chemistry - Kristen, Monday, July 5, 2010 at 10:59pm
Thanks I got it now
chemistry - susie, Monday, October 15, 2012 at 8:25pm
zinc plus copper sulfate gives zinc sulfate plus copper

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