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OpenStudy (anonymous):
How many moles of Na2Cr2O7 contain 14 moles of oxygen atoms?
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OpenStudy (anonymous):
Usually I just multiply moles by the subscripts which works. Doesn't make it the true chemical formula, but whatever. 2(Na2Cr2O7) Na4Cr4O14 All we care about is the oxygen. 2(O7)=O14 So I would say 2 moles of Na2Cr2O7 contains 14 moles of oxygen.
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