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Chemistry Regents January 2008 - Question 35 PDF Print E-mail
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Written by The Chemistry Wizard   

chemjan08q (35)

(4) 310 g/mol is the correct answer.

In order to calculate gram formula mass, you simply need to count the number of atoms in the compound and refer to the molar masses on your periodic table.

In this compound there are 3 Ca atoms (3 x 40), 2 P atoms (2 x 31), and 8 O atoms (8x16). 
120 + 62 + 128 = 310 g/mol.

 

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