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Solve for the empirical ND molecular formula of the following.
1) What is the molecular formula of a compound that has 85.7% carbon and 14.3% hydrogen by mass, of the molecular mass is 28g/mol?
2) A sample of a compound of boron and hydrogen contains 6.444g of B and 1.803g of H. The molar mass of the compound is about 30g. What is it's molecular formula?
3) A mercury salt has the following composition by mass; mercury, 80.69%; Sulfur 6.436%; oxygen 12.87%. Determine the empirical formula of the salt.
This compound is diborane and its molar mass is 27.67 g/mol. If you go back and divide the molecular mass by the empirical mass, the result is 2.000. So B₂H₆ is the correct molecular formula (27.67/13.843 = 2.000)
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