Science Help Online Worksheet 5-9a Determining Empirical Formula from Number of Moles

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1.  Determine the empirical formula of a compound that contains 36.5% sodium, 25.4% sulfur, and 38.1% oxygen.

2.  An organic compound has an empirical formula of CH and a molecular mass of 78 u.  What is the molecular formula?

3.  A hydrated compound has an analysis of 18.29% Ca, 32.37% Cl, and 49.34% H₂O.   What is the formula?

Answers     1)  Na₂SO₃                2) C₆H₆               CaCl₂ ^. 6H₂O

Please forward all questions, comments and criticisms to Gregory L. Curran.
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Last Modified March 18, 2004