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

FREE Expert Solution

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