# Number of Oxygen Atoms?

Calculate the number of oxygen atoms contained in 0.192g of Ga_2(CrO_4)_3

How do you do this?? i keep on getting 9.48 * 10^20 but that's not the correct answer. What am i doing wrong?

How do you do this?? i keep on getting 9.48 * 10^20 but that's not the correct answer. What am i doing wrong?

Update:
According to the answer key, the answer is 2.85*10^21

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