A sample of sodium dichromate, Na2Cr2O7, is placed into a container by itself. The sample of material in the container…

A sample of sodium dichromate, Na2 Cr2 O7 , is placed into a container by itself. The sample of material in the container is analyzed, and it is found to contain exactly 0.67 moles of sodium atoms. How many moles of oxygen atoms are in this sample?

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