C what is the mass fraction of oxygen in this

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(c) What is the mass fraction of oxygen in this compound? What is the percent by mass of oxygen in the compound?
(d) What mass of iron is in a 122 g sample of the compound?
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7. Fertilizers often contain phosphorus. A particular fertilizer is 26.9% phosphorus bymass. If you distribute 10.0 lb of this fertilizer on your garden, how many grams of phosphorus would be distributed? (1 lb = 453.6 g).
8.Three different samples containing only two elements, nitrogen and oxygen, are analyzed. Sample #1 weighs 36.00 g and contains 25.04 g of O. Sample #2 contains 69.56% O. Sample #3 contains 16.59 g of N and 28.41 g of O. Which statement is true? Show all of your work.
9. Write the nuclear symbol of Species X, including the correct element symbol, given thefollowing information:1.Species X has as many protons as an I–127 atom has neutrons. 2.The number of neutrons in Species X is the same as the number of electrons in atoms of Xe, Be, and Te combined. 3.There are as many electrons in Species X as there are protons in atoms of Er.

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