ANSWERS: 1
  • First step: calculate the molecular weight (MW) of calcium phosphate Go to the periodic table and find the MW of each element present Ca: 40.078 g/mol P: 30.97 g/mol O: 16 g/mol Now add up the MW for each element 3(40.078 g/mol) + 2[30.97 g/mol + 3(16 g/mol)] = 278.17 g/mol Now that you have the total MW for the molecule you will multiply the # of moles you have of the molecule by this to get the # grams (2.3 x 10-4 moles)( 278.17 g/mol) = 0.064 g or 64 mg of Ca3(PO3)2

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