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What's a formula mass?

55.847 (mass of Fe) + 3(15.999) (mass of 3 oxygen's) = 103.844 g

wait thats the formula of it?

that is how you find the formula mass.

im confused now

Do it steps @Tttaammmaannnaa

so the mass os 103.844 right?

the mass of Fe is 55.847. sorry

so the answer is 103.844

yes

ok thank you so much that helped a lot thank you again!