How many oxygen atoms are there in 310.2 gm of calcium phosphate?

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How many oxygen atoms are there in 310.2 gm of calcium phosphate?

since calcium phosphate is Ca3(PO4)2
molar mass of this compound is 310.2 then there are 8 oxygen atoms, right?

2006-12-21 10:26:28 · 2 answers · asked by silentcargo 3 in Science & Mathematics ➔ Chemistry

2 answers

No, there are 8 atoms in the molecule but there are 8x(6.02x10^23) oxygen atoms in 310.12 gm. The molar mass is the weight of one mole of the molecule, not one molecule.

2006-12-21 10:30:20 · answer #1 · answered by Anonymous · 0⤊ 0⤋

the moles of Ca3(PO4)2 : 310.2 / 310 = 1 mole
1 atom of Ca3(PO4)2 has 8 atoms of oxygen
thus, 1 mol of Ca3(PO4)2 has 8 mol of oxygen
the number of oxygen atoms : 8 * 6.02*10^23 = 4.816*10^24 atoms

2006-12-21 10:31:57 · answer #2 · answered by James Chan 4 · 0⤊ 0⤋