Answer:
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Explanation:
Gold has a molar mass of 197 g/mol. (a) how many moles of gold are in a 3.98 g sample of pure gold? (b) how many atoms are in th
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Answer: The empirical formula of the metal sulfide is .
Explanation:
Given: Mass of metal = 20.38 g
Mass of metal sulfide = 31.47 g
Moles is the mass of a substance divided by its molar mass.
So, moles of cobalt (molar mass = 59 g/mol) are as follows.
Moles of bromine (molar mass = 80 g/mol) are as follows.
Now, the ratio of number of moles of cobalt and number of moles of bromine are as follows.
Moles of Co : Moles of Br = 1 : 2
Hence, the empirical formula is .
Thus, we can conclude that the empirical formula of the metal sulfide is .