Question

Calculate the no. of calcium ion present in 25.7 grams of calcium phosphate.

Answer 1

Answer:

310.176722 g/mol

Explanation:

Element   Symbol   Atomic Mass   # of Atoms   Mass Percent

Calcium Ca 40.078 3 38.763%

Oxygen O 15.9994 8 41.265%

Phosphorus P 30.973761 2 19.972%

Answer 2

The chemical formula for calcium phosphate is  

Ca 3 (PO 4 ) 2

This means that in one mole of calcium phosphate, there are three calcium ions and two phosphate ions.

To determine the number of moles of  

Ca 2 +  ions that are in  25.7 moles of  Ca 3 (PO 4 ) 2 , do the following:

25.7 mol Ca 3 ( PO 4 ) 2  ×  (3 mol Ca 2 + /  1 mol Ca 3 ( PO 4) 2) = 77.1 mol Ca 2 +