A chloride of rhenium contains 63.6% rhenium. What is the name of this compound?
Empirical formula is
If we divide through by the lowest molar quantity (
This compound is rhenium(III) chloride.
We will be determining the empirical formula for this compound containing the elements rhenium (Re) and chlorine (Cl).
Since the only other element is chlorine, we can subtract the percentage of rhenium from 100% to calculate the percent of chlorine in the compound.
Since the percentages add to 100, we can assume a 100-g sample of the compound, and the percentages become mass in grams.
Moles of Each Element
Determine the moles of each element by dividing the mass by its molar mass (atomic weight on the periodic table in g/mol).
The empirical formula is
This compound has an empirical formula mass of 292.6 g/mol. According to Sigma-Aldrich, a chemical supplier, this compound is rhenium(III) chloride.