The formula for calcium phoshpate is
Ca3(PO4)2. First calculate the molar mass of that molecule. It is about 3x40 + 2x31 + 8x16 = 310 g/mol. You can get a more accurate value using more significant figures for ate atomic weights.
2 grams of the compound is only 2/31 mole. Multiply that by Avogadro's number for the number of molecules. There are 3 Ca2+ ions per molecule and 8 O atoms per molecule.
How many oxygen atoms do you have in 2.00 grams of calcium phosphate?
Do you use avogadro's number and how?
How many Ca^2+ ions do you have in 2.00 grams of calcium phosphate?
Any help would be greatly appreciated.
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