Problem: A 4.7 gram sample contains 1.82 g calcium, 0.94 g phosphorus and the rest is oxygen. What is the empirical formula for this compound?A. Ca15PO4     B. CaPO     C. Ca 2PO2     D. Ca 3PO3     E. Ca 3P2O8  

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Determine the empirical formula of a compound containing Ca, P and O using the provided mass. Using the masses of the atoms, figure out the moles of Ca, P and O. Then, the calculated moles will be divided by the smallest # of moles. This will be the # of atoms in the molecular formula. The steps for answering this problem will appear as:


Step 1. Determine the mass of O

Step 2. Calculate the moles of Ca, P and O using their atomic masses

Step 3. Divide the moles of Ca, P and O by the smallest # of moles


Recall that the empirical formula is the simplest whole-number ratio formula of a compound.


Step 1. Determine the mass of O

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Problem Details

A 4.7 gram sample contains 1.82 g calcium, 0.94 g phosphorus and the rest is oxygen. What is the empirical formula for this compound?

A. Ca15PO4     B. CaPO     C. Ca 2PO2     D. Ca 3PO3     E. Ca 3P2O8  

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