We’re being asked to determine the empirical formula of a compound composed of C, H, and O, given the mass percent of C, H and O.
Recall that the empirical formula is the simplest whole-number ratio formula of a compound.
Recall that mass percent is given by:
Assuming we have 100 g of the compound, this means we have 74.97 g C, 8.39 g H, and 16.64 g O.
Now, we need to get the moles of each element in the compound.
The atomic masses are 12.01 g/mol C, 1.01 g/mol H, and 16 g/mol O.
= 6.24 mol C
= 8.31 mol H
= 1.04 mol O
an unknown compound was determined to be 74.97% carbon, 8.39% hydrogen, and 16.64% oxygen. calculate the empirical formula
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