find mass of CaPO4 that contains 1.11 *10^24 atomes of Oxygen?

find the masss of CaPO4 that contains 1.11 *10^24 atomes of Oxygen
i found that the mass of O is 29.49g but after that i cant figure it out.

MT2012-09-27T20:40:23Z

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There is no CaPO4. Do you mean Ca3(PO4)2?