posted by Kristen .
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?
E. Not enough Info
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.
Thanks I got it now
zinc plus copper sulfate gives zinc sulfate plus copper