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Title: Mass of element from the mass of a compond Post by: Al333 on Jan 13, 2020 How to find out the mass of an element in a compound for example has a 48 g Question : 48g of Fe2CO3 Find the mass of oxygen Please i want it as soon as possible because i have a make up exam next week Title: Re: Mass of element from the mass of a compond Post by: duddy on Jan 15, 2020 What I'd do is find the molar mass of the entire molecule.
Iron...Fe 111.69 g/mol Carbon...C 12.0107 g/mol Oxygen...O 47.9982 g/mol Fe2CO3 = 171.6907 g / mol Take the mass, then divide it by this number to get the moles. Now set up a ratio: Moles of oxygen (3) to 1 molecule of Fe2CO3, and use that to find the mass of oxygen |