Problem: A chemist decomposes samples of several compounds; the masses of their constituent elements are listed. Calculate the empirical formula for each compound.2.128 g Be, 7.557 g S, 15.107 g O

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2.128 g Be, 7.557 g S, 15.107 g O

We need to get the moles of each element in the compound. 

The atomic masses are 9.012 g/mol Be, 32.06 g/mol S, and 16.00 g/mol O.

2.128 g Be×1 mol Be9.012 g Be = 0.2361 mol Be


7.557 g S×1 mol S32.06 g S = 0.2357 mol S


15.107 g O×1 mol O16.00 g O = 0.9442 mol O

Divide the number of moles of each by the smallest value.

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Problem Details

A chemist decomposes samples of several compounds; the masses of their constituent elements are listed. Calculate the empirical formula for each compound.

2.128 g Be, 7.557 g S, 15.107 g O

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