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Al333 Al333
wrote...
4 years ago

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
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wrote...
Staff Member
4 years ago
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


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