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Problem: How many oxygen atoms are there in 3.00 g of sodium dichromate, Na  2Cr2O7?A) 9.85 × 10 20 oxygen atomsB) 0.0801 oxygen atomsC) 6.90 × 10 21 oxygen atomsD) 4.83 × 10 22 oxygen atoms

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FREE Expert Solution

We are being asked to determine the number of oxygen atoms in 3.00 g of sodium dichromate, Na2Cr2O7


The flow of the problem is

mass Na2Cr2O7 (molar mass Na2Cr2O7) → mol Na2Cr2O7 (mol-to-mol ratio) → mol O (Avogadro’s number) → O atoms


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Problem Details

How many oxygen atoms are there in 3.00 g of sodium dichromate, Na  2Cr2O7?

A) 9.85 × 10 20 oxygen atoms

B) 0.0801 oxygen atoms

C) 6.90 × 10 21 oxygen atoms

D) 4.83 × 10 22 oxygen atoms

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Based on our data, we think this problem is relevant for Professor Moussa's class at VCU.