A 19.13 gram sample of chromium is heated in the presence of excess bromine. A metal bromide is formed with a mass of 77.92 g. Determine the empirical formula of the metal bromide.

The empirical formula of the compound is .

Explanation:

Mass of chromium = 19.13 g

Mass metal bromide formed = 77.92 g

Mass of bromine in metal bromide = 77.92 g - 19.13 g = 58.79 g

Moles of chromium metal :

Moles of bromine:

For empirical formula divide the smallest number of moles of element from the all the moles of elements:

chromium :

bromine :

The empirical formula of the compound is .

c. 75.7

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