How many oxygen atoms are in 3.00 g of sodium dichromate,Na₂Cr₂O₇?

Question

Quizplus · Accepted Answer

To find the number of oxygen atoms, first calculate the moles of Na2Cr2O7 in 3.00 g, then multiply by Avogadro's number and the number of oxygen atoms per formula unit (7). The molar mass of Na2Cr2O7 is approximately 261.97 g/mol, so 3.00 g is about 0.01145 moles. Multiplying by Avogadro's number (6.022 × 10^23) and 7 gives approximately 4.83 × 10^22 oxygen atoms.

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