A sample of sodium dichromate, Na2Cr2O7, 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?

1 Answer
anor277
Apr 28, 2018

Would there not be #(0.67*mol)/2xx7# with respect to oxygen ATOMS?

Explanation:

Look at the stoichiometry of the salt, #Na_2Cr_2O_7#...there are 2 mol each of metal, and 7 mol of oxygen atoms.

And thus will respect to oxygen there are #0.67*molxx7/2=2.35*mol#...what mass of oxygen is present....?

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