1. Identify the Formula and Oxygen Atoms:

* The correct formula for potassium dichromate is K₂Cr₂O₇.

* There are 7 oxygen atoms in each molecule of potassium dichromate.

2. Calculate Molar Mass:

* K: 39.10 g/mol * 2 = 78.20 g/mol

* Cr: 52.00 g/mol * 2 = 104.00 g/mol

* O: 16.00 g/mol * 7 = 112.00 g/mol

* Total Molar Mass: 78.20 + 104.00 + 112.00 = 294.20 g/mol

3. Calculate Oxygen Mass per Mole:

* Oxygen makes up (112.00 g/mol / 294.20 g/mol) * 100% = 38.07% of the total mass of potassium dichromate.

4. Calculate Oxygen Mass in 2 Moles:

* Oxygen mass in 2 moles = 2 moles * 294.20 g/mol * 0.3807 = 224.00 grams

Therefore, there are 224.00 grams of oxygen in 2 moles of potassium dichromate.