# Chemistry

A compound is formed when 12.2 g Mg combines completely with 5.16 g N. What is the percent composition of this compound? Please show all work and include the percentage of both magnesium and nitrogen.

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1. Don't panic just because this is a science question. If I asked the question this way I'll bet you could answer it. You have 1 lb of apples in a bucket and 1 lb of organges in the bucket; what's the percent apples. You would immediately say 50%. How did you get that.
(mass apples/total mass)*100 = (1 lb/2 lb)*100 = 50%. Do the same thing for this chemistry problem. They want %Mg and %N.Please post your work if you gfet stuck.

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2. it it was complete
percentMg=12.2/(12.2+5.16) * 100
percentN=5.16/(12.2+5.16) * 100

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3. Okay I got
70.28% and 29.7%
Now its telling me to Calculate the percent by mass of carbon in CO2 (carbon dioxide) how do I go about doing that?

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4. what is the mole mass of CO2?
percentC=atomicmassC/molmassCO2 * 100

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5. The mole mass of CO2 is 44.01 g/mol

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6. What do I put as percentC and atomic mass?

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