A 170.00 g sample of an unidentified compound contains 29.84 g sodium, 67.49 chromium, and 72.67 g oxygen. What is the compound's empirical formula?
1 Answer
Explanation:
So you have 29.84g of Sodium, 67.49g of chromium and 72.67g of oxygen
You would first find the number of mole of each substance in each given mass using:
Then you find the molar ratios between each element by dividing the moles by the lowest moles calculated
Molar ratio (Na) =
Molar ratio (Cr)
Molar ratio (O)
However 3.5 is not a whole number, to make a whole number we multiply it by 2 however if we do that we have to multiply each mol by 2 as well.
Molar ratio (Na) =
Molar ratio (Cr) =
Molar ratio (O) =
Then we can write the empirical formula