can anybody explain how to solve this?

A 13.5-gram piece of iron reacts with 1.4 grams of oxygen to form a compound. What is the percent composition of this compound?

A. 13.5% Fe, 1.4% O

B. 24.2% Fe, 8.8% O

C. 9.64% Fe, 10.4% O

D. 90.6% Fe, 9.4% O

E. 18.9% Fe, 81.1% O

Question

can anybody explain how to solve this?


A 13.5-gram piece of iron reacts with 1.4 grams of oxygen to form a compound. What is the percent composition of this compound?

A. 13.5% Fe, 1.4% O

B. 24.2% Fe, 8.8% O

C. 9.64% Fe, 10.4% O

D. 90.6% Fe, 9.4% O

E. 18.9% Fe, 81.1% O

aaronq · Answer

mass % of element(i)=mass of element(i)/Total mass of compound

anonymous · Answer

I am not sure how I would use the given info with that formula....:(

anonymous · Answer

thanks !:)

aaronq · Answer

it can't possibly be B, it has to add up to 100%

aaronq · Answer

D is likely the answer

anonymous · Answer

Can you please explain how you got D?

aaronq · Answer

Fe%=[1.4/(13.5+1.4)]*100%=9.39597 %

anonymous · Answer

thanks!